Update pytest.txt (#2226)

Author: seanpmorgan

tools/install_deps/pytest.txt

@@ -2,6 +2,6 @@ pytest~=5.3
 pytest-xdist~=1.31
 pytest-extra-durations~=0.1.3
 scikit-learn~=0.22
-scikit-image~=0.15.0
+scikit-image~=0.17.0
 Pillow~=7.0.0
 tqdm>=4.36.1