'NoneType' object has no attribute 'get_size' in "schedule_auto_resolution" and "schedule_auto_transition_to_ongoing"

### Environment self-hosted (https://develop.sentry.dev/self-hosted/) ### Steps to Reproduce 1. Deploy self hosted sentry using an external redis with SSL enabled 2. Set a BROKER_URL with the `rediss` schema. According to https://github.com/getsentry/sentry/issues/11309 , this is now supported. 3. A recurring couple of errors will now appear on the `internal` project, the "Crons" page as well as the sentry-worker logs, related to the `schedule_auto_resolution` and `schedule_auto_transition_to_ongoing` cron tasks. ### Expected Result All sentry features should be working normally when using redis with SSL enabled and a BROKER_URL with the rediss schema. ### Actual Result `sentry-worker` log excerpts: ``` 14:28:00 [ERROR] celery.app.trace: Task sentry.tasks.schedule_auto_transition_to_ongoing[e4626d8a-5988-491e-9b8d-3b004a916579] raised unexpected: AttributeError("'NoneType' object has no attribute 'get_size'") (data={'hostname': 'workist-sentry-worker-dfddb5467-l67nb', 'id': 'e4626d8a-5988-491e-9b8d-3b004a916579', 'name': 'sentry.tasks.schedule_auto_transition_to_ongoing', 'exc': 'AttributeError("\'NoneType\' object has no attribute \'get_size\'")', 'traceback': 'Traceback (most recent call last):\n File "/usr/local/lib/python3.8/site-packages/celery/app/trace.py", line 412, in trace_task\n R = retval = fun(*args, **kwargs)\n File "/usr/local/lib/python3.8/site-packages/sentry_sdk/integrations/celery.py", line 280, in _inner\n reraise(*exc_info)\n File "/usr/local/lib/python3.8/site-packages/sentry_sdk/_compat.py", line 99, in reraise\n raise value\n File "/usr/local/lib/python3.8/site-packages/sentry_sdk/integrations/celery.py", line 275, in _inner\n return f(*args, **kwargs)\n File "/usr/local/lib/python3.8/site-packages/celery/app/trace.py", line 704, in __protected_call__\n return self.run(*args, **kwargs)\n File "/usr/local/lib/python3.8/site-packages/sentry/silo/base.py", line 160, in override\n return original_method(*args, **kwar…