[maven-release-plugin] prepare release maven-3.1
[maven-release-plugin] prepare for next development iteration
Revert "[maven-release-plugin] prepare for next development iteration"

This reverts commit e22b2fa16a14551b6a9f8fd5776d21cf5ef6c663.
Revert "[maven-release-plugin] prepare release maven-3.1"

This reverts commit a47ef06832bff888928c66c525e18439b7a3c0f3.