chore(gradle): bump org.junit:junit-bom from 5.13.4 to 6.0.2

Bumps [org.junit:junit-bom](https://github.com/junit-team/junit-framework) from 5.13.4 to 6.0.2.
- [Release notes](https://github.com/junit-team/junit-framework/releases)
- [Commits](junit-team/junit-framework@r5.13.4...r6.0.2)

---
updated-dependencies:
- dependency-name: org.junit:junit-bom
  dependency-version: 6.0.2
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

gradle/libs.versions.toml

@@ -8,7 +8,7 @@ immutables = "2.12.1"
 jackson = "2.20.1"
 jetbrains = "26.0.2-1"
 jmh = "1.37"
-junit = "5.14.2"
+junit = "6.0.2"
 opencsv = "5.12.0"
 simpleflatmapper = "8.2.3"
 supercsv = "2.4.0"