activitypub: transmogrifier: make deletes secure

2 jobs for security/spoofing-hardening in 3 minutes and 5 seconds (queued for 12 seconds)
Name Stage Failure
lint Lint

$ MIX_ENV=test mix format --check-formatted
You may want to create test.secret.exs to declare custom database connection parameters.
** (Mix) mix format failed due to --check-formatted.
The following files were not formatted:

* test/web/federator_test.exs

ERROR: Job failed: exit code 1