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

This reverts commit e5436b8c1a79ce108f3af402455ac5f6dc5d1eb3.
Revert "[maven-release-plugin] prepare release v1.0.0-rc8"

This reverts commit 80eea0f111c06260ffaa780d2f3f7facd09c17bc.