Bump sha2 from 0.10.5 to 0.10.6 in /src/_bcrypt (#419)

Bumps [sha2](https://github.com/RustCrypto/hashes) from 0.10.5 to 0.10.6.
- [Release notes](https://github.com/RustCrypto/hashes/releases)
- [Commits](https://github.com/RustCrypto/hashes/compare/sha2-v0.10.5...sha2-v0.10.6

)

---
updated-dependencies:
- dependency-name: sha2
  dependency-type: indirect
  update-type: version-update:semver-patch
...

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