Fixed ruff warnings

Author: c8y3

scripts/gunicorn-cfg.py

@@ -27,4 +27,3 @@
 
 def worker_exit(server, worker):
     sys.exit(4)
-

tests_database_migration/test_harness/iris.py

@@ -98,4 +98,3 @@ def clear_database(self):
             identifier = user['user_id']
             self.get(f'/manage/users/deactivate/{identifier}')
             self.create(f'/manage/users/delete/{identifier}', {})
-

upgrades/upgrade_to_2.0.0.py

@@ -168,4 +168,3 @@ def check(silent=False):
 
     if args.check:
         iu.check()
-