TYP: fix mypy ignored error in pandas/tests/io/test_fsspec.py
- [ ] xref #37715
- [ ] tests added / passed
- [ ] passes `black pandas`
- [ ] passes `git diff upstream/master -u -- "*.py" | flake8 --diff`
- [ ] whatsnew entry

Handle mypy ignored error in pandas/tests/io/test_fsspec.py

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