Update pages.yml

Author: coder137

.github/workflows/pages.yml

@@ -19,6 +19,7 @@ jobs:
 
       - name: Setup
         run: |
+          sudo apt-get update
           sudo apt-get install ninja-build doxygen graphviz python3-sphinx
           pip install breathe sphinx_rtd_theme furo sphinxcontrib-plantuml