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

@@ -17,7 +17,7 @@ webpki-roots = ["hyper-rustls/webpki-roots"]
 
 [dependencies]
 async-trait = "0.1"
-base64 = "0.21"
+base64 = "0.22"
 chrono = { version = "0.4.31", features = ["serde"] }
 home = "0.5.5"
 hyper = { version = "0.14.2", features = ["client", "runtime", "http2"] }