[SentryIO] Cog doesn't seem to catch unhandled exceptions in a task

[Jackenmen]

Code:

[p]eval ```py
async def blah():
    raise RuntimeError(":(")

asyncio.create_task(blah())
```

produces log entry:

[2021-02-19 03:36:36] [CRITICAL] red.main: Caught unhandled exception in task:
Traceback (most recent call last):
  File "<string>", line 4, in blah
RuntimeError: :(

but SentryIO cog doesn't seem to send it to Sentry.

[MrNinjajuice]

[2021-02-19 03:36:36] [CRITICAL] red.main: Caught unhandled exception in task:
Traceback (most recent call last):
File "", line 4, in blah
RuntimeError: :(