hardcode the action branch

Author: AndyEveritt

.github/workflows/publish-to-pypi.yml

@@ -34,7 +34,7 @@ jobs:
           git config --global user.email '[email protected]'
           git commit -am "Release ${{ github.event.release.name }}"
           git tag -f ${{ github.event.release.tag_name }}
-          git push origin HEAD:${{ github.ref_name }}
+          git push origin HEAD:v3.6-dev
           git push origin -f --tags
 
   build: