tests/test_types.py::test_file_surrogates test is missing the skipif not _non_utf8_filenames_supported marker

[RuRo]

The title says it all. There are a bunch of tests in tests/test_types.py that do some checks with non-utf8 filenames. Some filesystems don't support non-utf8 filenames, so the main test_path_surrogates test is conditionally disabled with

@pytest.mark.skipif(
    not _non_utf8_filenames_supported(),
    reason="The current OS or FS doesn't support non-UTF-8 filenames.",
)

However, the next two tests (test_file_surrogates and test_file_error_surrogates) are missing these marks.

The fix should be pretty simple - add the above-mentioned decorator to these tests as well.