Remove pip cache from setup-python since no requirements file exists to key it

.github/workflows/deploy-docs.yml

@@ -34,7 +34,6 @@ jobs:
         uses: actions/setup-python@v5
         with:
           python-version: "3.11"
-          cache: "pip"
 
       - name: Install dependencies
         run: pip install mkdocs mkdocs-material mkdocs-glightbox mkdocs-panzoom-plugin mkdocs-minify-plugin