Merge branch 'main' into glitch-soc/merge-upstream

Conflicts:
- `.github/workflows/build-image.yml`:
  Upstream updated `docker/build-push-action`, and we a different config
  for `docker/metadata-action` so the lines directly above were different,
  but it's not a real conflict.
  Upgraded `docker/build-push-action` as upstream did.
- `app/javascript/mastodon/features/compose/components/compose_form.js`:
  Upstream changed the codestyle near a line we had modified to accommodate
  configurable character count.
  Kept our change.

app/controllers/api/v1/notifications_controller.rb

@@ -6,7 +6,7 @@ class Api::V1::NotificationsController < Api::BaseController
   before_action :require_user!
   after_action :insert_pagination_headers, only: :index
 
-  DEFAULT_NOTIFICATIONS_LIMIT = 15
+  DEFAULT_NOTIFICATIONS_LIMIT = 40
 
   def index
     @notifications = load_notifications