chore(deps): bump solidity version to v0.8.21 (#221)

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## Overview

When verifying the QGB contract, these were signaled by Etherscan:

https://sepolia.etherscan.io/solcbuginfo?a=FullInlinerNonExpressionSplitArgumentEvaluationOrder

https://sepolia.etherscan.io/solcbuginfo?a=MissingSideEffectsOnSelectorAccess

Which are fixed with this version bump.

Also closes:
#136

## Checklist

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PRs should be left in Draft until the below checklist is completed.
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- [ ] New and updated code has appropriate documentation
- [ ] New and updated code has new and/or updated testing
- [ ] Required CI checks are passing
- [ ] Visual proof for any user facing features like CLI or
documentation updates
- [ ] Linked issues closed with keywords

foundry.toml

@@ -1,4 +1,4 @@
 [profile.default]
-solc_version = "0.8.20"
+solc_version = "0.8.21"
 via_ir = true
 gas_reports = ["*"]

hardhat.config.ts

@@ -5,7 +5,7 @@ import fs from "fs";
 
 const config: HardhatUserConfig = {
   solidity: {
-    version: "0.8.20",
+    version: "0.8.21",
     settings: {
       optimizer: {
         enabled: true,

scripts/Dockerfile_Environment

@@ -25,7 +25,7 @@ RUN apt update && apt install -y git build-essential software-properties-common
 RUN curl -L https://foundry.paradigm.xyz | bash && . /root/.bashrc && foundryup
 
 # install solc
-RUN wget https://github.com/ethereum/solidity/releases/download/v0.8.19/solc-static-linux -O /usr/bin/solc && chmod +x /usr/bin/solc
+RUN wget https://github.com/ethereum/solidity/releases/download/v0.8.21/solc-static-linux -O /usr/bin/solc && chmod +x /usr/bin/solc
 
 # install go
 RUN wget https://go.dev/dl/go1.21.1.linux-amd64.tar.gz && rm -rf /usr/local/go && tar -C /usr/local -xzf go1.21.1.linux-amd64.tar.gz && echo 'PATH=$PATH:/usr/local/go/bin:/root/go/bin' >> ~/.bashrc

src/Blobstream.sol

@@ -1,5 +1,5 @@
 // SPDX-License-Identifier: Apache-2.0
-pragma solidity ^0.8.19;
+pragma solidity ^0.8.21;
 
 import "openzeppelin-contracts-upgradeable/contracts/access/OwnableUpgradeable.sol";
 import "openzeppelin-contracts-upgradeable/contracts/proxy/utils/Initializable.sol";

src/Constants.sol

@@ -1,5 +1,5 @@
 // SPDX-License-Identifier: Apache-2.0
-pragma solidity ^0.8.19;
+pragma solidity ^0.8.21;
 
 /// @dev bytes32 encoding of the string "checkpoint"
 bytes32 constant VALIDATOR_SET_HASH_DOMAIN_SEPARATOR =

src/DataRootTuple.sol

@@ -1,5 +1,5 @@
 // SPDX-License-Identifier: Apache-2.0
-pragma solidity ^0.8.19;
+pragma solidity ^0.8.21;
 
 /// @notice A tuple of data root with metadata. Each data root is associated
 ///  with a Celestia block height.

src/lib/tree/Constants.sol

@@ -1,5 +1,5 @@
 // SPDX-License-Identifier: Apache-2.0
-pragma solidity ^0.8.19;
+pragma solidity ^0.8.21;
 
 import "./Types.sol";
 

src/lib/tree/Types.sol

@@ -1,5 +1,5 @@
 // SPDX-License-Identifier: Apache-2.0
-pragma solidity ^0.8.19;
+pragma solidity ^0.8.21;
 
 /// @notice A representation of the Celestia-app namespace ID and its version.
 /// See: https://celestiaorg.github.io/celestia-app/specs/namespace.html

src/lib/tree/Utils.sol

@@ -1,5 +1,5 @@
 // SPDX-License-Identifier: Apache-2.0
-pragma solidity ^0.8.19;
+pragma solidity ^0.8.21;
 
 import "./Constants.sol";
 

src/lib/tree/binary/BinaryMerkleProof.sol

@@ -1,5 +1,5 @@
 // SPDX-License-Identifier: Apache-2.0
-pragma solidity ^0.8.19;
+pragma solidity ^0.8.21;
 
 /// @notice Merkle Tree Proof structure.
 struct BinaryMerkleProof {

src/lib/tree/binary/BinaryMerkleTree.sol

@@ -1,5 +1,5 @@
 // SPDX-License-Identifier: Apache-2.0
-pragma solidity ^0.8.19;
+pragma solidity ^0.8.21;
 
 import "../Constants.sol";
 import "../Utils.sol";

src/lib/tree/binary/TreeHasher.sol

@@ -1,5 +1,5 @@
 // SPDX-License-Identifier: Apache-2.0
-pragma solidity ^0.8.19;
+pragma solidity ^0.8.21;
 
 import "../Constants.sol";
 

src/lib/tree/binary/test/BinaryMerkleTree.t.sol

@@ -1,5 +1,5 @@
 // SPDX-License-Identifier: Apache-2.0
-pragma solidity ^0.8.19;
+pragma solidity ^0.8.21;
 
 import "ds-test/test.sol";
 

src/lib/tree/binary/test/TreeHasher.t.sol

@@ -1,5 +1,5 @@
 // SPDX-License-Identifier: Apache-2.0
-pragma solidity ^0.8.19;
+pragma solidity ^0.8.21;
 
 import "ds-test/test.sol";
 

src/lib/tree/namespace/NamespaceMerkleMultiproof.sol

@@ -1,5 +1,5 @@
 // SPDX-License-Identifier: Apache-2.0
-pragma solidity ^0.8.19;
+pragma solidity ^0.8.21;
 
 import "./NamespaceNode.sol";
 

src/lib/tree/namespace/NamespaceMerkleProof.sol

@@ -1,5 +1,5 @@
 // SPDX-License-Identifier: Apache-2.0
-pragma solidity ^0.8.19;
+pragma solidity ^0.8.21;
 
 import "./NamespaceNode.sol";
 

src/lib/tree/namespace/NamespaceMerkleTree.sol

@@ -1,5 +1,5 @@
 // SPDX-License-Identifier: Apache-2.0
-pragma solidity ^0.8.19;
+pragma solidity ^0.8.21;
 
 import "../Constants.sol";
 import "../Types.sol";

src/lib/tree/namespace/NamespaceNode.sol

@@ -1,5 +1,5 @@
 // SPDX-License-Identifier: Apache-2.0
-pragma solidity ^0.8.19;
+pragma solidity ^0.8.21;
 
 import "../Types.sol";
 

src/lib/tree/namespace/TreeHasher.sol

@@ -1,5 +1,5 @@
 // SPDX-License-Identifier: Apache-2.0
-pragma solidity ^0.8.19;
+pragma solidity ^0.8.21;
 
 import "../Constants.sol";
 import "../Types.sol";

src/lib/tree/namespace/test/NamespaceMerkleMultiproof.t.sol

@@ -1,5 +1,5 @@
 // SPDX-License-Identifier: Apache-2.0
-pragma solidity ^0.8.19;
+pragma solidity ^0.8.21;
 
 import "ds-test/test.sol";
 

src/lib/tree/namespace/test/NamespaceMerkleTree.t.sol

@@ -1,5 +1,5 @@
 // SPDX-License-Identifier: Apache-2.0
-pragma solidity ^0.8.19;
+pragma solidity ^0.8.21;
 
 import "ds-test/test.sol";
 

src/lib/tree/namespace/test/TreeHasher.t.sol

@@ -1,5 +1,5 @@
 // SPDX-License-Identifier: Apache-2.0
-pragma solidity ^0.8.19;
+pragma solidity ^0.8.21;
 
 import "ds-test/test.sol";
 

src/lib/tree/test/Utils.t.sol

@@ -1,5 +1,5 @@
 // SPDX-License-Identifier: Apache-2.0
-pragma solidity ^0.8.19;
+pragma solidity ^0.8.21;
 
 import "ds-test/test.sol";
 

src/lib/verifier/DAVerifier.sol

@@ -1,5 +1,5 @@
 // SPDX-License-Identifier: Apache-2.0
-pragma solidity ^0.8.19;
+pragma solidity ^0.8.21;
 
 import "openzeppelin-contracts/contracts/utils/cryptography/ECDSA.sol";
 

src/lib/verifier/test/DAVerifier.t.sol

@@ -1,5 +1,5 @@
 // SPDX-License-Identifier: Apache-2.0
-pragma solidity ^0.8.19;
+pragma solidity ^0.8.21;
 
 import "openzeppelin-contracts/contracts/utils/cryptography/ECDSA.sol";
 

src/lib/verifier/test/RollupInclusionProofs.t.sol

@@ -1,5 +1,5 @@
 // SPDX-License-Identifier: Apache-2.0
-pragma solidity ^0.8.19;
+pragma solidity ^0.8.21;
 
 import "openzeppelin-contracts/contracts/utils/cryptography/ECDSA.sol";
 

src/test/Blobstream.t.sol

@@ -1,5 +1,5 @@
 // SPDX-License-Identifier: Apache-2.0
-pragma solidity ^0.8.19;
+pragma solidity ^0.8.21;
 
 import "openzeppelin-contracts/contracts/utils/cryptography/ECDSA.sol";