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

This reverts commit c2b7b2d04a58b8be0fab6b570a14eb6b08d26436.
Revert "[maven-release-plugin] prepare release 5.5.0.Final.rfc.1"

This reverts commit a579a813820d25ea923be38f783ecf98118f7d38.