ci: use the stable foundry version (#349)

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## Overview

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<!-- This is an auto-generated comment: release notes by coderabbit.ai
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## Summary by CodeRabbit

- **Chores**
- Upgraded our build, test, and analysis pipelines to use a stable
toolset, ensuring a more consistent and reliable environment throughout
the development process.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

.github/workflows/code-analysis.yml

@@ -20,7 +20,7 @@ jobs:
       - name: Install Foundry
         uses: onbjerg/foundry-toolchain@v1
         with:
-          version: nightly
+          version: stable
 
       - name: Build project
         working-directory: ./

.github/workflows/lint.yml

@@ -17,7 +17,7 @@ jobs:
       - name: Install Foundry
         uses: onbjerg/foundry-toolchain@v1
         with:
-          version: nightly
+          version: stable
 
       - name: Format Solidity files
         working-directory: ./

.github/workflows/tests.yml

@@ -50,7 +50,7 @@ jobs:
       - name: Install Foundry
         uses: onbjerg/foundry-toolchain@v1
         with:
-          version: nightly
+          version: stable
 
       - name: Install Go Ethereum devtools
         working-directory: ./