build(deps): bump proto-plus from 1.25.0 to 1.26.0

Bumps [proto-plus](https://github.com/googleapis/proto-plus-python) from 1.25.0 to 1.26.0.
- [Release notes](https://github.com/googleapis/proto-plus-python/releases)
- [Changelog](https://github.com/googleapis/proto-plus-python/blob/main/CHANGELOG.md)
- [Commits](googleapis/proto-plus-python@v1.25.0...v1.26.0)

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

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

requirements.txt

@@ -83,7 +83,7 @@ Pillow==11.1.0
 pkce==1.0.3
 praw==7.8.1
 prawcore==2.4.0
-proto-plus==1.25.0
+proto-plus==1.26.0
 protobuf==5.29.3
 pyasn1==0.6.1
 pyasn1-modules==0.4.1