Actually test Java 17
Actually test Java 17

Earlier change did not actually test Java 17.

MarkEWaite/git-plugin,martinda/git-plugin,MarkEWaite/git-plugin,martinda/git-plugin,MarkEWaite/git-plugin,jenkinsci/git-plugin,jenkinsci/git-plugin,MarkEWaite/git-plugin,jenkinsci/git-plugin,jenkinsci/git-plugin,martinda/git-plugin