fix PathInfo instantiation in Python 3.12

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 45.45455% with 6 lines in your changes are missing coverage. Please review.

Project coverage is 90.21%. Comparing base (491155c) to head (33ab0ed).

Files	Patch %	Lines
dvc/testing/path_info.py	28.57%	4 Missing and 1 partial :warning:
dvc/testing/tmp_dir.py	75.00%	0 Missing and 1 partial :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #10328 +/- ## ========================================== - Coverage 90.58% 90.21% -0.37% ========================================== Files 499 499 Lines 38546 38547 +1 Branches 5566 5558 -8 ========================================== - Hits 34915 34774 -141 - Misses 2986 3081 +95 - Partials 645 692 +47 ```

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[efiop]

Thank you @skshetry ! 🙏