Update uv pip install command to use --system flag

.github/workflows/actions.yml

@@ -50,7 +50,7 @@ jobs:
       - name: Install dependencies
         run: |
           python -m pip install --upgrade uv
-          uv pip install -r requirements.txt
+          uv pip install -r requirements.txt --system
           sudo apt-get install -y ruby ruby-dev build-essential
           sudo gem install asciidoctor
         if: steps.cache.outputs.cache-hit != 'true'