Play Framework

chore(deps): update test/build-infra dependencies (PF-151)

Surfaces missed by the framework/dependencies.yml audits — separate manifests
and committed jars outside Renovate's reach:

- gradle-plugin junit-jupiter 6.0.3 -> 6.1.0 (align with framework JUnit)
- lib-test: mockito 5.19.0 -> 5.23.0, assertj 3.27.3 -> 3.27.7,
  objenesis 3.4 -> 3.5, ant + ant-junitlauncher 1.10.15 -> 1.10.17
- Gradle wrapper 9.5.0 -> 9.6.0
- CI setup-java distribution adopt -> temurin (deprecated alias that already
  resolves to Temurin; silences the per-run notice + future-proofs)

Verified: ant test (724 tests, 0 failures); ./gradlew :gradle-plugin:build on
Gradle 9.6.0 with JUnit 6.1.0 (BUILD SUCCESSFUL).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>