Update base64 requirement from 0.21.5 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@v0.21.5...v0.22.1)

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

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

Author: dependabot[bot]

Cargo.toml

@@ -13,7 +13,7 @@ categories = ["web-programming"]
 publish = true
 
 [dependencies]
-base64 = "0.21.5"
+base64 = "0.22.1"
 bcrypt = "0.15.0"
 rand = "0.8.5"
 rocket = { version = "=0.5.0", features = ["secrets"] }