release: cut the v12.1.0-next.6 release (angular#42587)

PR Close angular#42587

release: cut the v12.0.5 release (angular#42585)

PR Close angular#42585

release: cut the v12.1.0-next.5 release (angular#42534)

release: cut the v12.0.4 release (angular#42531)

release: cut the v12.1.0-next.4 release

release: cut the v12.0.3 release

release: cut the v12.1.0-next.3 release (angular#42360)

release: cut the v12.0.2 release (angular#42353)

release: cut the v12.1.0-next.2 release (angular#42178)

release: cut the v12.0.1 release (angular#42175)