Bump sha2 from 0.9.5 to 0.9.6 (#91)

Bumps [sha2](https://github.com/RustCrypto/hashes) from 0.9.5 to 0.9.6.
- [Release notes](https://github.com/RustCrypto/hashes/releases)
- [Commits](RustCrypto/hashes@sha2-v0.9.5...sha2-v0.9.6)

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

Signed-off-by: dependabot[bot] <[email protected]>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>