Fixed unclosed file warnings

[radarhere]

https://github.com/python-pillow/Pillow/actions/runs/12842724013/job/35813939701#step:6:5420

Tests/test_file_libtiff.py::TestFileLibTiff::test_buffering[Tests/images/old-style-jpeg-compression-no-samplesperpixel.tif]
Tests/test_file_libtiff.py::TestFileLibTiff::test_buffering[Tests/images/old-style-jpeg-compression-no-samplesperpixel.tif]
/vpy3/lib/python3.10/site-packages/_pytest/python.py:159: ResourceWarning: unclosed file <_io.BufferedReader name='Tests/images/old-style-jpeg-compression-no-samplesperpixel.tif'>
result = testfunction(**testargs)
Enable tracemalloc to get traceback where the object was allocated.
See https://docs.pytest.org/en/stable/how-to/capture-warnings.html#resource-warnings for more info.

Tests/test_file_libtiff.py::TestFileLibTiff::test_buffering[Tests/images/old-style-jpeg-compression.tif]
Tests/test_file_libtiff.py::TestFileLibTiff::test_buffering[Tests/images/old-style-jpeg-compression.tif]
/vpy3/lib/python3.10/site-packages/_pytest/python.py:159: ResourceWarning: unclosed file <_io.BufferedReader name='Tests/images/old-style-jpeg-compression.tif'>
result = testfunction(**testargs)
Enable tracemalloc to get traceback where the object was allocated.
See https://docs.pytest.org/en/stable/how-to/capture-warnings.html#resource-warnings for more info.