build(gradle): Bump org.junit.jupiter:junit-jupiter from 5.14.0 to 6.0.0

Bumps [org.junit.jupiter:junit-jupiter](https://github.com/junit-team/junit-framework) from 5.14.0 to 6.0.0.
- [Release notes](https://github.com/junit-team/junit-framework/releases)
- [Commits](junit-team/junit-framework@r5.14.0...r6.0.0)

---
updated-dependencies:
- dependency-name: org.junit.jupiter:junit-jupiter
  dependency-version: 6.0.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

build.gradle

@@ -30,7 +30,7 @@ subprojects {
 
     // Shared dependency versions
     ext.freefair_version = '8.14.2'
-    ext.junit_version = '5.14.0'
+    ext.junit_version = '6.0.0'
     ext.log4j_version = '2.25.1'
     ext.mockito_version = '5.2.0'
     ext.spark_version = '3.5.0'