[maven-release-plugin] copy for tag gerrit-trigger-2.21.1

[maven-release-plugin] copy for tag gerrit-trigger-2.21.0

[maven-release-plugin] copy for tag gerrit-trigger-2.20.0

[maven-release-plugin] copy for tag gerrit-trigger-2.19.0

[maven-release-plugin] copy for tag gerrit-trigger-2.18.4

[maven-release-plugin] copy for tag gerrit-trigger-2.18.3

[maven-release-plugin] copy for tag gerrit-trigger-2.18.2

[maven-release-plugin] copy for tag gerrit-trigger-2.18.1

[maven-release-plugin] copy for tag gerrit-trigger-2.18.0

[maven-release-plugin] copy for tag gerrit-trigger-2.17.5