build(deps): bump base64 from 0.13.1 to 0.21.7

Bumps [base64](https://github.com/marshallpierce/rust-base64) from 0.13.1 to 0.21.7.
- [Changelog](https://github.com/marshallpierce/rust-base64/blob/master/RELEASE-NOTES.md)
- [Commits](marshallpierce/rust-base64@v0.13.1...v0.21.7)

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

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

Author: dependabot[bot]

Cargo.lock

@@ -34,7 +34,7 @@ opt-level = 2
 [dependencies]
 anyhow = "1.0.52"
 async-trait = "0.1.52"
-base64 = "0.13.0"
+base64 = "0.21.7"
 chrono = "0.4.9"
 futures = "0.3.19"
 hdrhistogram = "7.5.0"