1.21

🚀 New features and improvements

• Update default Jenkinsfile to include Java 21 (#651) @NotMyFault

📝 Documentation updates

• Use most recent release in example docs (#656) @MarkEWaite

👻 Maintenance

• chore(docs) update README to exclude central repository from mirror (#661) @dduportal

📦 Dependency updates

• Update dependency io.jenkins.tools.bom:bom-2.387.x to v2423 (#662) @renovate
• Update dependency org.jenkins-ci.plugins:plugin to v4.73 (#660) @renovate
• Update maven Docker tag to v3.9.4 (#659) @renovate
• Update dependency io.jenkins.tools.bom:bom-2.387.x to v2378 (#658) @renovate
• Update dependency io.jenkins.tools.bom:bom-2.387.x to v2357 (#655) @renovate
• Replace org.kohsuke:pom with io.jenkins.tools:central-repository-pom (#654) @NotMyFault
• Update dependency io.jenkins.tools.bom:bom-2.387.x to v2329 (#653) @renovate
• Update dependency org.jenkins-ci.plugins:plugin to v4.72 (#652) @renovate
• Update dependency io.jenkins.tools.bom:bom-2.387.x to v2312 (#649) @renovate