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

This reverts commit f8e611955096c5c1c7db5764b9d2851b1d295f0d.
Revert "[maven-release-plugin] prepare release v1.0.0-rc9"

This reverts commit 920f947eb5a22a679c0c3186cf69ee75f6041c75.