Remove apt-maven-plugin settings

[mklinkj]

Hello

In the querydsl example project, it appears that the apt-maven-plugin configuration isn’t necessary.

By explicitly setting the classifier of querydsl-apt to jpa, the maven-compiler-plugin seems to handle the annotation processor well, even without the apt-maven-plugin configuration.

thank you have a good day. 👍

• apt-maven-plugin alternatives querydsl/querydsl#3201