Bump sha2 from 0.8.0 to 0.8.1

Bumps [sha2](https://github.com/RustCrypto/hashes) from 0.8.0 to 0.8.1.
- [Release notes](https://github.com/RustCrypto/hashes/releases)
- [Commits](https://github.com/RustCrypto/hashes/compare/sha2-v0.8.0...sha2-v0.8.1)

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

sdk-c/Cargo.toml

@@ -20,7 +20,7 @@ rand_chacha = "0.1.1"
 rand_core = { version = ">=0.2, <0.4", default-features = false }
 solana-sdk = { path = "../sdk", version = "0.23.0" }
 ed25519-dalek = "1.0.0-pre.1"
-sha2 = "0.8.0"
+sha2 = "0.8.1"
 
 [build-dependencies]
 cbindgen = "0.12.1"