fix(deps): update dependency com.google.protobuf:protobuf-java-util to v4

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
com.google.protobuf:protobuf-java-util (source)	3.25.5 -> 4.28.3

---

Configuration

📅 Schedule: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined).

🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.

♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

---

• [ ] If you want to rebase/retry this PR, check this box

---

This PR was generated by Mend Renovate. View the repository job log.

[trask]

similar to https://github.com/open-telemetry/opentelemetry-java/pull/6295#issuecomment-2368722209

blockers:

1. opentelemetry-proto-java still depends on an older version of grpc java. Need to bump those dependencies and cut a release: https://github.com/open-telemetry/opentelemetry-proto-java/pull/17. Not clear how we cut a release since opentelemetry-proto-java versions are currently coupled to opentelemetry-proto releases.

[laurit]

@trask I think we can merge this. Protobuf is only a testing dependency so having the tests pass is the only thing we need.

[trask]

@trask I think we can merge this. Protobuf is only a testing dependency so having the tests pass is the only thing we need.

good point 👍