[ANNOUNCE] GMavenPlus 4.0.0

GMavenPlus 4.0.0 has been released and should be available on Maven Central
shortly.
Bugs

None
Enhancements

   - Support Java 22 and 23 (#302
   <https://github.com/groovy/GMavenPlus/pull/302>)
   - Multiple dependency upgrades, including some that fixed CVEs
   - Added a warning about using SecurityManager to prevent System.exit()
    calls. JEP 411 <https://openjdk.org/jeps/411> deprecated SecurityManager
   <https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/SecurityManager.html>
in
   Java 17, for future removal. It is unclear what it will be replaced with
   for the use case of preventing System.exit() usages. JDK-8199704
   <https://bugs.openjdk.org/browse/JDK-8199704> is one possibility.

Potentially breaking changes

   - Updated the required Maven version to 3.6.3 to conform to the
   compatibility plan (#309 <https://github.com/groovy/GMavenPlus/pull/309>)

Notes

None