[NEW RELEASE] sonar-checkstyle 9.2.1

Hi,

Short description:
Issue #394: use sonar api version 8.9.0 for full 8.9.x compatibility
Issue #395: update to checkstyle 9.2.1

Sonarqube compatibility: 8.9-LATEST
JDK: 1.8

SonarCloud project dashboard: https://sonarcloud.io/dashboard?id=checkstyle_sonar-checkstyle

PR: https://github.com/SonarSource/sonar-update-center-properties/pull/264

Thanks,
Daniel Mühlbachler-Pietrzykowski

Merged! :smiley: