Update base64 requirement from 0.21.4 to 0.22.1

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@v0.21.4...v0.22.1)

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

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

Author: dependabot[bot]

Cargo.toml

@@ -27,7 +27,7 @@ byteorder = "1"
 [dev-dependencies]
 serde = { version = "1.0", features = ["derive"] }
 serde_json = "1.0.107"
-base64 = "0.21.4"
+base64 = "0.22.1"
 num_enum = "0.7.0"
 
 [profile.release]