Bump blake2 from 0.10.3 to 0.10.4

Bumps [blake2](https://github.com/RustCrypto/hashes) from 0.10.3 to 0.10.4.
- [Release notes](https://github.com/RustCrypto/hashes/releases)
- [Commits](https://github.com/RustCrypto/hashes/commits

)

---
updated-dependencies:
- dependency-name: blake2
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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