v3.30.0 🎁

📦 Dependency Updates

• Bump com.puppycrawl.tools:checkstyle from 10.12.5 to 10.12.6 (#875) @dependabot
• Bump mockito.version from 5.7.0 to 5.8.0 (#871) @dependabot
• Bump archunit.version from 1.2.0 to 1.2.1 (#872) @dependabot
• Bump com.github.spotbugs:spotbugs-maven-plugin from 4.8.1.0 to 4.8.2.0 (#873) @dependabot
• Bump org.apache.maven.plugins:maven-javadoc-plugin from 3.6.2 to 3.6.3 (#874) @dependabot
• Bump com.uber.nullaway:nullaway from 0.10.17 to 0.10.18 (#870) @dependabot
• Bump actions/setup-java from 3 to 4 (#866) @dependabot
• Bump spotbugs.version from 4.8.1 to 4.8.2 (#863) @dependabot
• Bump nl.jqno.equalsverifier:equalsverifier from 3.15.3 to 3.15.4 (#864) @dependabot

🔧 Internal Changes

• Add CheckStyle checks to ensure no empty lines (#876) @uhafner
• Use autograding v3 (#869) @uhafner
• Enable error prone warnings (#867) @uhafner