chore(gh-ci): update docs deployment (DSP-1741) (#463)

Author: kilchenmann

.github/workflows/main.yml

@@ -114,7 +114,7 @@ jobs:
       - name: Checkout main
         uses: actions/checkout@v2
       - name: Deploy docs
-        uses: mhausenblas/mkdocs-deploy-gh-pages@master
+        uses: mhausenblas/mkdocs-deploy-gh-pages@1.16
         env:
           GITHUB_TOKEN: ${{ secrets.GH_TOKEN }}
           REQUIREMENTS: docs/requirements.txt