Require Jenkins 2.479.1 and Jakarta EE 9 (#53)

Require Jenkins 2.479.1 and Jakarta EE 9 so that we can eventually remove
more of the compatibility layer that provides compatibility with plugins
built for Java EE 8 and other earlier technologies.

Enable automated release (#51)

Simplify future releases by making them automatic whenever significant
changes are merged to the master branch.

Tagged by Mark Waite to match Jenkins release 0.3

[maven-release-plugin] copy for tag saferestart-0.7

[maven-release-plugin] copy for tag saferestart-0.6

[maven-release-plugin] copy for tag saferestart-0.5

[maven-release-plugin] copy for tag saferestart-0.4

[maven-release-plugin] copy for tag saferestart-0.2

[maven-scm] copy for tag saferestart-0.1