deps(rust): update base64 requirement from ^0.21.5 to ^0.22.0

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@v0.21.5...v0.22.0)

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

Signed-off-by: dependabot[bot] <support@github.com>

Cargo.toml

@@ -20,7 +20,7 @@ broker = ["dep:compact_jwt", "compact_jwt/msextensions", "dep:kanidm-hsm-crypto"
 tpm = ["broker", "kanidm-hsm-crypto/tpm"]
 
 [dependencies]
-base64 = "^0.21.5"
+base64 = "^0.22.0"
 reqwest = { version = "^0.11.24", features = ["json", "cookies"] }
 serde = { version = "^1.0.180", features = ["derive"] }
 serde_json = "^1.0.96"