Update sha2 requirement from 0.9 to 0.10 (#165)

Updates the requirements on [sha2](https://github.com/RustCrypto/hashes) to permit the latest version.
- [Release notes](https://github.com/RustCrypto/hashes/releases)
- [Commits](RustCrypto/hashes@groestl-v0.9.0...sha2-v0.10.0)

---
updated-dependencies:
- dependency-name: sha2
  dependency-type: direct:production
...

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Author: dependabot[bot]

Cargo.toml

@@ -34,7 +34,7 @@ num-traits = "0.2"
 quick-error = "2"
 rand = "0.8"
 rand_chacha = "0.3"
-sha2 = "0.9"
+sha2 = "0.10"
 
 [dev-dependencies]
 criterion = "0.3"