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.

spec/services/import_service_spec.rb

@@ -91,10 +91,6 @@ RSpec.describe ImportService, type: :service do
 
     let(:csv) { attachment_fixture('mute-imports.txt') }
 
-    before do
-      allow(NotificationWorker).to receive(:perform_async)
-    end
-
     describe 'when no accounts are followed' do
       let(:import) { Import.create(account: account, type: 'following', data: csv) }
       it 'follows the listed accounts, including boosts' do
@@ -135,10 +131,6 @@ RSpec.describe ImportService, type: :service do
 
     let(:csv) { attachment_fixture('new-following-imports.txt') }
 
-    before do
-      allow(NotificationWorker).to receive(:perform_async)
-    end
-
     describe 'when no accounts are followed' do
       let(:import) { Import.create(account: account, type: 'following', data: csv) }
       it 'follows the listed accounts, respecting boosts' do