4346 [google_sign_in_web] Update URL to google_sign_in package in README (cla: yes, waiting for tree to go green, p: google_sign_in, platform-web, last mile)

4348 Give the labeler access to PRs (cla: yes)

4349 [ci] use background script (cla: yes)

4350 [ci] Grant contents: write permission to release.yml (cla: yes)

4352 [in_app_purchase] Bump minimum Flutter version and iOS deployment target (cla: yes, waiting for tree to go green, p: in_app_purchase, platform-ios)

4353 [ios_platform_images] Bump minimum Flutter version and iOS deployment target (cla: yes, waiting for tree to go green, p: ios_platform_images, platform-ios)