Update protobuf requirement from 5.28.0 to 5.28.1 (#159)

Updates the requirements on [protobuf](https://github.com/protocolbuffers/protobuf) to permit the latest version.
- [Release notes](https://github.com/protocolbuffers/protobuf/releases)
- [Changelog](https://github.com/protocolbuffers/protobuf/blob/main/protobuf_release.bzl)
- [Commits](protocolbuffers/protobuf@v5.28.0...v5.28.1)

---
updated-dependencies:
- dependency-name: protobuf
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

pyproject.toml

@@ -22,7 +22,7 @@ classifiers = [
 
 [tool.poetry.dependencies]
 python = "^3.8"
-protobuf = "5.28.0"
+protobuf = "5.28.1"
 grpcio = "1.66.1"
 grpcio-tools = "1.66.1"
 jsonpickle = ">=3.0,<3.4"