build(deps-dev): bump lib.junit.version from 5.11.4 to 6.0.0

Bumps `lib.junit.version` from 5.11.4 to 6.0.0.

Updates `org.junit.jupiter:junit-jupiter` from 5.11.4 to 6.0.0
- [Release notes](https://github.com/junit-team/junit-framework/releases)
- [Commits](https://github.com/junit-team/junit-framework/compare/r5.11.4...r6.0.0)

Updates `org.junit.jupiter:junit-jupiter-api` from 5.11.4 to 6.0.0
- [Release notes](https://github.com/junit-team/junit-framework/releases)
- [Commits](https://github.com/junit-team/junit-framework/compare/r5.11.4...r6.0.0)

Updates `org.junit.jupiter:junit-jupiter-engine` from 5.11.4 to 6.0.0
- [Release notes](https://github.com/junit-team/junit-framework/releases)
- [Commits](https://github.com/junit-team/junit-framework/compare/r5.11.4...r6.0.0)

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

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

pom.xml

@@ -103,7 +103,7 @@
         <lib.greenmail.version>2.1.6</lib.greenmail.version>
         <lib.json-java.version>20250517</lib.json-java.version>
         <lib.json-unit.version>4.1.1</lib.json-unit.version>
-        <lib.junit.version>5.11.4</lib.junit.version>
+        <lib.junit.version>6.0.0</lib.junit.version>
         <lib.lucene.version>8.11.4</lib.lucene.version>
         <lib.maven-artifact.version>3.9.11</lib.maven-artifact.version>
         <lib.mockserver-netty.version>5.15.0</lib.mockserver-netty.version>