build(deps): bump proto-plus from 1.22.3 to 1.23.0

Bumps [proto-plus](https://github.com/googleapis/proto-plus-python) from 1.22.3 to 1.23.0.
- [Release notes](https://github.com/googleapis/proto-plus-python/releases)
- [Changelog](https://github.com/googleapis/proto-plus-python/blob/main/CHANGELOG.md)
- [Commits](https://github.com/googleapis/proto-plus-python/compare/v1.22.3...v1.23.0)

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

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

requirements.txt

@@ -72,7 +72,7 @@ pbr==6.0.0
 pkce==1.0.3
 praw==7.7.1
 prawcore==2.4.0
-proto-plus==1.22.3
+proto-plus==1.23.0
 protobuf==4.24.3
 pyasn1==0.5.1
 pyasn1-modules==0.3.0