imageio test failure with Pillow >= 8.2

[grlee77]

Description

Some of our CI runs fail with the recently released Pillow 8.2.0 (example: https://github.com/scikit-image/scikit-image/pull/5313/checks?check_run_id=2270643861#step:5:507).

This seems to be caused by the change of an error type from SyntaxError to OSError in the following upstream commit:
python-pillow/Pillow@22e9bee

We will need to account for this by modifying the following test that currently fails:

scikit-image/skimage/io/tests/test_imageio.py

Lines 38 to 39 in afbb2b5

	with testing.raises(SyntaxError):
	imread(fetch('data/truncated.jpg'))