Fix some longstanding bugs in the testing infrastructure, and a bug in `fs.touch()`
What's Changed
* fix: Actually test using remote url instead of local fs by nsmith- in https://github.com/scikit-hep/fsspec-xrootd/pull/80
* [pre-commit.ci] pre-commit autoupdate by pre-commit-ci in https://github.com/scikit-hep/fsspec-xrootd/pull/78
**Full Changelog**: https://github.com/scikit-hep/fsspec-xrootd/compare/v0.5.0...v0.5.1