Bump protobuf from 5.27.2 to 5.28.2 in /Browser

Bumps [protobuf](https://github.com/protocolbuffers/protobuf) from 5.27.2 to 5.28.2.
- [Release notes](https://github.com/protocolbuffers/protobuf/releases)
- [Changelog](https://github.com/protocolbuffers/protobuf/blob/main/protobuf_release.bzl)
- [Commits](protocolbuffers/protobuf@v5.27.2...v5.28.2)

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

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

Browser/requirements.txt

@@ -1,6 +1,6 @@
 grpcio == 1.66.2
 grpcio-tools == 1.66.2
-protobuf == 5.27.2
+protobuf == 5.28.2
 robotframework >= 5.0.1, < 8.0.0
 robotframework-pythonlibcore >= 4.4.1, < 5.0.0
 robotframework-assertion-engine >= 3.0.3, < 4.0.0