Update ci.yml

Author: Jacqueline-Tsai

.github/workflows/ci.yml

@@ -16,8 +16,8 @@ jobs:
       - uses: actions/cache@v4
         with:
             key: ${{ github.ref }}
-            path: .cache
-      - run: sudo apt-get update && sudo apt-get install -y libxml2-dev libxslt-dev python-dev
+            path: ~/.cache/pip
+      - run: sudo apt-get update && sudo apt-get install -y libxml2-dev libxslt-dev python3-dev
       - run: pip install mkdocs-material
       - run: pip install -r requirements.txt
       - run: mkdocs gh-deploy --force