Prepare 1.21.1 release (#11619)
Prepare 1.21.1 release (#11619)

Co-authored-by: Jonny Harris <29f93c676e4016c6bbf8a7ea5bd5f436232efb02@users.noreply.github.com>
GoogleForCreators/web-stories-wp,GoogleForCreators/web-stories-wp,GoogleForCreators/web-stories-wp,GoogleForCreators/web-stories-wp,GoogleForCreators/web-stories-wp