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

This reverts commit e1dc5bedb48d2ac9b9e1c9b3b1a15c41b7d90ad8.
Revert "[maven-release-plugin] prepare release v0.9.0-incubating"

This reverts commit 0771df675363c69622404cb514bd751bc90526af.
Updating changes file
[maven-release-plugin] prepare release v0.9.0-incubating
[maven-release-plugin] prepare for next development iteration