Use threading.Event for _eventloop_set instead of anyio.Event
#2647
| Job | Run time |
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| 1m 42s | |
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| 1m 43s | |
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| 3m 12s | |
| 3m 0s | |
| 3m 24s | |
| 1m 57s | |
| 17s | |
| 2s | |
| 55m 56s |