requirements: update protobuf requirement from <3.20.4 to <5.28.3

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@v2.4.1...v5.28.2)

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

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

requirements.txt

@@ -15,7 +15,7 @@ packaging<25.0
 pandas<2.2.3
 pillow<10.5.0
 pint<0.22.0
-protobuf<3.20.4
+protobuf<5.28.3
 rich>=10.1, <10.13
 scipy>=1.7.3, <1.15
 toposort<1.11