change sphinx version installed on publish

Author: tsolakoua

.github/workflows/publish.yml

@@ -21,9 +21,9 @@ jobs:
       - name: Install dependencies
         run: |
           python -m pip install --upgrade pip
-          python -m pip install sphinx
+          python -m pip install sphinx==1.7.2
           pip install tox
-          pip install sphinx_rtd_theme
+          pip install sphinx_rtd_theme==0.2.4
           pip install virtualenv==20.0.1
       - name: Test with tox
         run: |