fix tox compatibility for docs build

Issue: ZENKO-4975

Author: benzekrimaha

docs/tox.ini

@@ -19,11 +19,16 @@ description = Render documentation
 skip_install = true
 deps =
 #     {[testenv]deps}
-    -r{toxinidir}/docsource/requirements.txt
 commands =
+    pip install --upgrade pip
+    pip install setuptools==64.0.0
+    pip install -r{toxinidir}/docsource/requirements.txt
+    pip list
     make -C docsource {posargs:html}
 setenv =
     O=-j4 -n -W
     SPHINXOPTS=-j4 -n -W
 whitelist_externals =
     make
+    pip
+