Bump secp256k1 from 0.24.3 to 0.28.0

Bumps [secp256k1](https://github.com/rust-bitcoin/rust-secp256k1) from 0.24.3 to 0.28.0.
- [Changelog](https://github.com/rust-bitcoin/rust-secp256k1/blob/master/CHANGELOG.md)
- [Commits](rust-bitcoin/rust-secp256k1@secp256k1-0.24.3...secp256k1-0.28.0)

---
updated-dependencies:
- dependency-name: secp256k1
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

substrate/primitives/core/Cargo.toml

@@ -49,7 +49,7 @@ blake2 = { version = "0.10.4", default-features = false, optional = true }
 libsecp256k1 = { version = "0.7", default-features = false, features = ["static-context"], optional = true }
 schnorrkel = { version = "0.9.1", features = ["preaudit_deprecated", "u64_backend"], default-features = false }
 merlin = { version = "2.0", default-features = false }
-secp256k1 = { version = "0.24.0", default-features = false, features = ["recovery", "alloc"], optional = true }
+secp256k1 = { version = "0.28.0", default-features = false, features = ["recovery", "alloc"], optional = true }
 sp-core-hashing = { path = "hashing", default-features = false, optional = true }
 sp-runtime-interface = { path = "../runtime-interface", default-features = false}
 

substrate/primitives/io/Cargo.toml

@@ -28,7 +28,7 @@ sp-trie = { path = "../trie", default-features = false, optional = true}
 sp-externalities = { path = "../externalities", default-features = false}
 sp-tracing = { path = "../tracing", default-features = false}
 log = { version = "0.4.17", optional = true }
-secp256k1 = { version = "0.24.0", features = ["recovery", "global-context"], optional = true }
+secp256k1 = { version = "0.28.0", features = ["recovery", "global-context"], optional = true }
 tracing = { version = "0.1.29", default-features = false }
 tracing-core = { version = "0.1.28", default-features = false}