Add missing install python library before release

Author: atthaboon

.github/workflows/pythonpublish.yml

@@ -17,6 +17,7 @@ jobs:
       run: |
         python -m pip install --upgrade pip
         pip install setuptools wheel twine
+        pip install -r requirements.txt
     - name: Update keywords document
       run: |
         python -m robot.libdoc -f html PuppeteerLibrary docs/PuppeteerLibrary.html