chore(deps): update compatible Java test tooling

[fabian-barney]

Closes #79

Summary

• Updates the Maven JUnit property to the latest compatible stable line.
• Preserves Java 17. Gradle wrapper/Jacoco plugin updates are deferred until the Gradle plugin validation gate is cleaned up.

Validation

• mvn -B verify passed. gradle-plugin\gradlew.bat check still fails in existing spotbugsTest findings, so the Gradle plugin dependency surface was intentionally not changed.

Review Notes

• Dependency-only change; no public runtime floor was raised.
• Latest-compatible versions were selected over latest-absolute releases when framework or runtime constraints required it.

[Copilot]

Pull request overview

This PR updates the repository-wide JUnit BOM version used by the Maven build (and any consumers of the parent POM), aiming to keep test tooling on a latest-compatible stable line while preserving the Java 17 baseline.

Changes:

• Bumped the parent POM junit.version property from 6.0.3 to 6.1.0 (via org.junit:junit-bom import).

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[fabian-barney]

Closing this automation PR because the only proposed dependency change, JUnit 6.1.0, failed the offline CI test phase and was backed out. The branch now has no file changes; issue #79 remains open with the blockers.