Skip flaky WmsTimeDimension.ipynb test (#1355)

Author: Conengmo

tests/selenium/test_selenium.py

@@ -26,6 +26,8 @@ def find_notebooks():
 
 @pytest.mark.parametrize('filepath', find_notebooks())
 def test_notebook(filepath, driver):
+    if 'WmsTimeDimension' in filepath:
+        pytest.xfail('WmsTimeDimension.ipynb external resource makes this test flaky')
     for filepath_html in get_notebook_html(filepath):
         driver.get_file(filepath_html)
         try: