chore(deps): update base64 requirement from 0.13 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@v0.13.0...v0.22.0)

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

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

sentinel-core/Cargo.toml

@@ -61,7 +61,7 @@ lru = "0.7.5"
 etcd-rs = { version = "0.6", optional = true }
 consul = { version = "0.4", optional = true }
 futures = { version = "0.3.17", optional = true }
-base64 = { version = "0.13", optional = true }
+base64 = { version = "0.22", optional = true }
 kube = { version = "0.76", features = ["derive", "runtime"], optional = true }
 k8s-openapi = { version = "0.16.0", default-features = false, features = [
   "v1_25",