3148.v532a_7e715ee3

🐛 Bug fixes

• JENKINS-38520 - Every message in agent log appears twice with the -agentLog option (#664) @basil

👻 Maintenance

• Test on Java 21 (#660) @NotMyFault

📦 Dependency updates

• Bump org.apache.ant:ant from 1.10.13 to 1.10.14 (#663) @dependabot
• Bump org.jenkins-ci:jenkins from 1.103 to 1.104 (#659) @dependabot
• Bump bc-version from 1.75 to 1.76 (#658) @dependabot