chore(deps): update base64 requirement from 0.21 to 0.22

Updates the requirements on [base64](https://github.com/marshallpierce/rust-base64) to permit the latest version.
- [Changelog](https://github.com/marshallpierce/rust-base64/blob/master/RELEASE-NOTES.md)
- [Commits](marshallpierce/rust-base64@v0.21.0...v0.22.0)

---
updated-dependencies:
- dependency-name: base64
  dependency-type: direct:production
...

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

Cargo.toml

@@ -15,7 +15,7 @@ edition = "2021"
 anyhow = "1.0.30"
 async-trait = "0.1"
 base16ct = { version = "0.2", features = ["std"] }
-base64 = "0.21"
+base64 = "0.22"
 futures = "0.3"
 hmac = "0.12"
 md-5 = "0.10"