Bump checker from 3.50.0 to 3.51.0

Bumps `checker` from 3.50.0 to 3.51.0.

Updates `org.checkerframework:checker` from 3.50.0 to 3.51.0
- [Release notes](https://github.com/typetools/checker-framework/releases)
- [Changelog](https://github.com/typetools/checker-framework/blob/master/docs/CHANGELOG.md)
- [Commits](typetools/checker-framework@checker-framework-3.50.0...checker-framework-3.51.0)

Updates `org.checkerframework:checker-qual` from 3.50.0 to 3.51.0
- [Release notes](https://github.com/typetools/checker-framework/releases)
- [Changelog](https://github.com/typetools/checker-framework/blob/master/docs/CHANGELOG.md)
- [Commits](typetools/checker-framework@checker-framework-3.50.0...checker-framework-3.51.0)

---
updated-dependencies:
- dependency-name: org.checkerframework:checker
  dependency-version: 3.51.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
- dependency-name: org.checkerframework:checker-qual
  dependency-version: 3.51.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

gradle/libs.versions.toml

@@ -7,7 +7,7 @@ build-plugins = "2025.4-SNAPSHOT"
 
 # using the embedded kotlin version of gradle to avoid mixed versions
 kotlin = "2.2.10"
-checker = "3.50.0"
+checker = "3.51.0"
 checkerp = "0.6.56"
 jacoco = "0.8.11"
 updates = "0.52.0"