RATIS-2458. Ignore protobuf-java-util, too

[adoroszlai]

Previously we added a rule to avoid major version upgrades for protobuf-java (ef22b10), which dependabot confirmed. But now it wants to bump protobuf-java-util (#119).

updater | 2026/05/27 10:29:44 INFO <job_1386203310> Checking if com.google.protobuf:protobuf-java 3.25.9 needs updating
updater | 2026/05/27 10:29:44 INFO <job_1386203310> Ignored versions:
updater | 2026/05/27 10:29:44 INFO <job_1386203310>   version-update:semver-major - from .github/dependabot.yml
...
updater | 2026/05/27 10:29:44 INFO <job_1386203310> All updates for com.google.protobuf:protobuf-java were ignored
...
updater | 2026/05/27 10:29:51 INFO <job_1386203310> Checking if com.google.protobuf:protobuf-java-util 3.25.9 needs updating
...
updater | 2026/05/27 10:29:53 INFO <job_1386203310> Updating com.google.protobuf:protobuf-java, com.google.protobuf:protobuf-java-util
updater | 2026/05/27 10:29:53 INFO <job_1386203310> Submitting com.google.protobuf:protobuf-java, com.google.protobuf:protobuf-java-util pull request for creation

https://github.com/apache/ratis-thirdparty/actions/runs/26505443144/job/78056488218

This addendum tweaks the dependabot rule to ignore all protobuf artifacts.

https://issues.apache.org/jira/browse/RATIS-2458

[szetszwo]

+1 the change looks good.

[adoroszlai]

Thanks @szetszwo for the review.