Verify compatibility with Java 25

[DirkMahler]

It shall be verified if the proposed 2.9 release is compatible with Java 25, i.e. whether the build is ok an the Maven plugin can be used in a Java 25 project.

[Bramaten]

• jQAssistant build with Java 25 possible without any problems
• Testing of Maven and CLI of a short Java 25 project with execution of scan, analyze, server, report, available-rules also worked without any problems