chore(deps): bump base64 in /bots/rhodibot

Bumps [base64](https://github.com/marshallpierce/rust-base64) in `/bots/rhodibot` from 0.22.1 to 0.23.1.


Updates `base64` from 0.22.1 to 0.23.1
- [Changelog](https://github.com/marshallpierce/rust-base64/blob/master/RELEASE-NOTES.md)
- [Commits](marshallpierce/rust-base64@v0.22.1...v0.23.1)

---
updated-dependencies:
- dependency-name: base64
  dependency-version: 0.23.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: cargo
...

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

Author: dependabot[bot]

bots/rhodibot/Cargo.lock

@@ -37,7 +37,7 @@ toml = "1.1.2+spec-1.1.0"
 # which matters because CI builds with `--locked` and a regenerated lock would
 # otherwise have to be trusted sight-unseen.
 ring = "0.17"
-base64 = "0.22"
+base64 = "0.23"
 
 # Crypto for webhook verification
 hmac = "0.13.0"