[MSHADE-124] keep original basedir after set d-r-p location to build dir

[gzm55]

From maven 3.2.5, the pom and basedir are seperated
(apache/maven@c15226f),
and add new api MavenProject::setPomFile() to only upodate pom location.

In this pr, the minimal maven version is bumped to 3.2.5, then use
setPomFile to only update pom file location, leaving ${basedir}
unchanged.

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