fix readthedoc python dependencies (#8166)

d-a-v · web-flow · commit d3136738ad2e · 2021-06-23T21:08:26.000+02:00
diff --git a/doc/requirements.txt b/doc/requirements.txt
@@ -4,3 +4,7 @@ sphinx
 sphinx-rtd-theme
 breathe
 nbsphinx
+docutils<0.17
+testresources
+#at the time of writing, requirement is pygments<3,>=2.4.1
+pygments>=2.4.1
