Bump base64 from 0.21.0 to 0.21.1

Bumps [base64](https://github.com/marshallpierce/rust-base64) from 0.21.0 to 0.21.1.
- [Changelog](https://github.com/marshallpierce/rust-base64/blob/master/RELEASE-NOTES.md)
- [Commits](https://github.com/marshallpierce/rust-base64/commits)

---
updated-dependencies:
- dependency-name: base64
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

Cargo.lock

@@ -50,5 +50,5 @@ qrcode = "0.12.0"
 urlencoding = "2.1.2"
 regex = "1.8.1"
 lazy_static = "1.4.0"
-base64 = "0.21.0"
+base64 = "0.21.1"
 md-5 = "0.10.5"