While it should be closed in logging's shutdown [1], the following would
still issue a ResourceWarning:
```
import logging
log_file_handler = logging.FileHandler("temp.log", mode="w", encoding="UTF-8")
root_logger = logging.getLogger()
root_logger.addHandler(log_file_handler)
root_logger.removeHandler(log_file_handler)
root_logger.error("error")
del log_file_handler
```
It looks like the weakref might get lost for some reason.
See https://github.com/pytest-dev/pytest/pull/4981/commits/92ffe42b45 / #4981
for more information.
1: c1419578a1/Lib/logging/__init__.py (L2107-L2139)
Daniel Hahler