unpin pytest version in CI script

build-and-test-py-project.sh

@@ -57,7 +57,7 @@ $PIP install setuptools
 
 # Pinned to 3.0.4 because of https://github.com/pytest-dev/pytest/issues/2434
 # Install before a newer version gets pulled in as a dependency
-$PIP install pytest==3.0.4 pytest-warnings==0.2.0
+#$PIP install pytest==3.0.4 pytest-warnings==0.2.0
 
 if test "$EXTRA_INSTALL" != ""; then
   for i in $EXTRA_INSTALL ; do