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

This reverts commit 8f9dcd04dffba819509c466781b35bc446cd39a8.
Revert "[maven-release-plugin] prepare release 4.3.0-RC2"

This reverts commit 5a92803157d1e62c57c75712d2d640acdfc263b7.