[maven-release-plugin] copy for tag v6.9.0

[maven-release-plugin] copy for tag v6.8.1

[maven-release-plugin] copy for tag v6.8.0

[maven-release-plugin] copy for tag v6.7.0

[maven-release-plugin] copy for tag v6.6.0

[maven-release-plugin] copy for tag v6.5.0

[maven-release-plugin] copy for tag v6.4.0

[maven-release-plugin] copy for tag v6.3.0

[maven-release-plugin] copy for tag v6.2.0

[maven-release-plugin] copy for tag v6.1.0