Fix path separator inconsistency in crop_raster tests on Windows

[Abhishek-Dimri]

This PR fixes the path separator inconsistency in the test_crop_raster_valid_crop and test_crop_raster_png_unprojected tests on Windows (Issue #924). The issue occurs because the crop_raster function returns paths with forward slashes (/), while the tests expect backslashes (\).

Changes:

• Normalized both the result and expected_filename paths in the tests using os.path.normpath().
• Ensured that the tests work correctly on all operating systems.

Testing:

• Ran the test suite on Windows and confirmed that the tests pass:
  pytest -v

[ethanwhite]

Thanks for this @Abhishek-Dimri!

[Abhishek-Dimri]

Thank you, @ethanwhite , for reviewing and merging the PR! I'm glad I could contribute to the project. Looking forward to helping out with more issues in the future! 😊