[PR] [improve][build] Upgrade Checkstyle from 10.14.2 to 13.3.0 [pulsar]

["lhotari (via GitHub)" <gi...@apache.org>]

lhotari opened a new pull request, #25440:
URL: https://github.com/apache/pulsar/pull/25440

   ### Motivation
   
   Upgrade Checkstyle from 10.14.2 to 13.3.0 to get the latest rule improvements, bug fixes, and Java 21 support. The old DTD URLs pointing to `puppycrawl.com` are deprecated and have been updated to `checkstyle.org`.
   
   ### Modifications
   
   - Updated Checkstyle version from `10.14.2` to `13.3.0` in `gradle/libs.versions.toml`
   - Updated DTD URL in `buildtools/src/main/resources/pulsar/checkstyle.xml` from `http://www.puppycrawl.com/dtds/configuration_1_3.dtd` to `https://checkstyle.org/dtds/configuration_1_3.dtd`
   - Updated DTD URL in `buildtools/src/main/resources/pulsar/suppressions.xml` from `http://www.puppycrawl.com/dtds/suppressions_1_1.dtd` to `https://checkstyle.org/dtds/suppressions_1_1.dtd`
   
   ### Verifying this change
   
   - [x] Make sure that the change passes the CI checks.
   
   This change is a trivial rework / code cleanup without any test coverage.
   
   Verified locally with `./gradlew checkstyleMain checkstyleTest` — all 303 tasks passed successfully.
   
   ### Does this pull request potentially affect one of the following parts:
   
   - [x] Dependencies (add or upgrade a dependency)
   - [ ] The public API
   - [ ] The schema
   - [ ] The default values of configurations
   - [ ] The threading model
   - [ ] The binary protocol
   - [ ] The REST endpoints
   - [ ] The admin CLI options
   - [ ] The metrics
   - [ ] Anything that affects deployment
   
   ### Documentation
   
   - [x] `doc-not-needed`
   
   ### Matching PR in forked repository
   
   PR in forked repository: <!-- ENTER URL HERE -->


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Re: [PR] [improve][build] Upgrade Checkstyle from 10.14.2 to 13.3.0 [pulsar]

["lhotari (via GitHub)" <gi...@apache.org>]

lhotari merged PR #25440:
URL: https://github.com/apache/pulsar/pull/25440


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