Fix document publishing GitHub Action

It seems that Chromium is no longer found automatically. See also
puppeteer/puppeteer#9533.

.github/workflows/publish.yaml

@@ -20,7 +20,9 @@ jobs:
         run: sudo python3 -m pip install gitpython pandocfilters
 
       - name: Install mermaid diagram filter
-        run: sudo npm install --global mermaid-filter
+        run: |
+          echo '{ "overrides": { "puppeteer": "^21" } }' > package.json
+          sudo npm install --loglevel verbose --global mermaid-filter
 
       - name: Build documentation
         run: cd doc/doxygen-root && make && touch html/.nojekyll