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

This reverts commit f8809f3138bf9208d1e1b92e8974a7d662887142.
Revert "[maven-release-plugin] prepare release 6.2.1"

This reverts commit 434b98de37934277a5a41f3a9c6a53434284009e.
[maven-release-plugin] prepare release 6.2.1
Revert "[maven-release-plugin] prepare release 6.2.1"

This reverts commit 9b8a6ebcd9cb7a798d31b5e90f0efbee46331cb3.