build(deps): bump sha2 from 0.9.3 to 0.9.4 (#394)

Bumps [sha2](https://github.com/RustCrypto/hashes) from 0.9.3 to 0.9.4.
- [Release notes](https://github.com/RustCrypto/hashes/releases)
- [Commits](RustCrypto/hashes@sha2-v0.9.3...sha2-v0.9.4)

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

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

Author: dependabot[bot]