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

Conflicts:
- `app/javascript/mastodon/features/compose/components/poll_form.js`:
  Upstream bumped poll option character limit, but we already had
  a higher one, kept ours.
- `app/validators/poll_validator.rb`:
  Upstream bumped poll option character limit, but we already had
  a higher one, kept ours.
- `config/initializers/content_security_policy.rb`:
  Upstream added a rule, the way we compute ours is different, but
  that added rule has been ported.
- `package.json`:
  No real conflict, dependency update. Performed the same update.
- `yarn.lock`:
  No real conflict, dependency update. Performed the same update.

app/controllers/settings/imports_controller.rb

@@ -29,6 +29,6 @@ class Settings::ImportsController < Settings::BaseController
   end
 
   def import_params
-    params.require(:import).permit(:data, :type)
+    params.require(:import).permit(:data, :type, :mode)
   end
 end