Fix annotation processing warnings

[hubertp]

Introduced in #8286.

[warn] Unexpected javac output: Note: Annotation processing is enabled because one or more processors were found
[warn]   on the class path. A future release of javac may disable annotation processing
[warn]   unless at least one processor is specified by name (-processor), or a search
[warn]   path is specified (--processor-path, --processor-module-path), or annotation
[warn]   processing is enabled explicitly (-proc:only, -proc:full).
[warn]   Use -Xlint:-options to suppress this message.
[warn]   Use -proc:none to disable annotation processing..
[info] Note: Annotation processing is enabled because one or more processors were found

[JaroslavTulach]

Thank you.

[Akirathan]

Yes, this is a new warning introduced in JDK 21. Thanks for the fix.