The maven parent should avoid setting maven.compiler.source and maven.compiler.target for JDK >= 11

[gnodet]

Affected version

45

Bug description

The two properties have side effects, and it would be better to not define them and just define maven.compiler.release when running on JDK >= 11.

See apache/maven-compiler-plugin#982

[desruisseaux]

The fix in #505 looks fine to me and would remove an annoyance in the compiler plugin. For the javac command, (source, target) and release are mutually exclusive: we should specify one of them, but it is considered an error by javac to specify both.