Revert "[maven-release-plugin] prepare for next development iteration"

This reverts commit aab41bd5e814a6d132ad2c35068e1ed3a502e3c6.
Revert "[maven-release-plugin] prepare release qrgen-1.3"

This reverts commit 57d8a36d09538df631ccfbff465e3316391a2c85.