Compatibility update to SonarQube 8.9 LTS. There have been breaking API changes in the Sonar Java plugin that AEM Rules use as a depenency. This release removes reliance on no longer available methods, preventing runtime failures.
See #213
Update plugin metadata to require a lower version of the Java plugin than the RC 1.4 version, which made the requirement too strict
See #224
Remove explicit dependency on the Java plugin. It is expected to be present out-of-the-box https://community.sonarsource.com/t/new-release-aem-rules-1-5/61314