Bump base64 from 0.22.0 to 0.22.1 in /src/rust (#10914)

Bumps [base64](https://github.com/marshallpierce/rust-base64) from 0.22.0 to 0.22.1.
- [Changelog](https://github.com/marshallpierce/rust-base64/blob/master/RELEASE-NOTES.md)
- [Commits](marshallpierce/rust-base64@v0.22.0...v0.22.1)

---
updated-dependencies:
- dependency-name: base64
  dependency-type: indirect
  update-type: version-update:semver-patch
...

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