build(deps): bump protobuf from 4.25.4 to 5.28.1

Bumps [protobuf](https://github.com/protocolbuffers/protobuf) from 4.25.4 to 5.28.1.
- [Release notes](https://github.com/protocolbuffers/protobuf/releases)
- [Changelog](https://github.com/protocolbuffers/protobuf/blob/main/protobuf_release.bzl)
- [Commits](protocolbuffers/protobuf@v4.25.4...v5.28.1)

---
updated-dependencies:
- dependency-name: protobuf
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

requirements.txt

@@ -78,7 +78,7 @@ pkce==1.0.3
 praw==7.7.1
 prawcore==2.4.0
 proto-plus==1.24.0
-protobuf==4.25.4
+protobuf==5.28.1
 pyasn1==0.6.1
 pyasn1-modules==0.4.1
 pycparser==2.22