[`flake8-use-pathlib`] Make `PTH100` fix unsafe because it can change behavior (#20100)
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## Summary
Fixes https://github.com/astral-sh/ruff/issues/20088
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## Test Plan
`cargo nextest run flake8_use_pathlib`
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Co-authored-by: Brent Westbrook <brentrwestbrook@gmail.com>
ruff
f558bf72 - [`flake8-use-pathlib`] Make `PTH100` fix unsafe because it can change behavior (#20100)
