Bump phpstan/extension-installer from 1.1.0 to 1.2.0 (#12493)
Bump phpstan/extension-installer from 1.1.0 to 1.2.0 (#12493)

Co-authored-by: dependabot[bot] <1c358da00a777d4e9898c1280ab801e2df165188@users.noreply.github.com>
GoogleForCreators/web-stories-wp,GoogleForCreators/web-stories-wp,GoogleForCreators/web-stories-wp,GoogleForCreators/web-stories-wp,GoogleForCreators/web-stories-wp