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

This reverts commit 0f7c8ca5d1c83403ec92e54483a43a31f3c898a6.
Revert "[maven-release-plugin] prepare release 4.0.9"

This reverts commit 0768b7fd75757c77409bbc513ece6fea38f2e806.