Simplify docs action

Author: DavidWalz

.github/workflows/docs.yml

@@ -11,30 +11,18 @@ jobs:
     concurrency:
       group: ${{ github.workflow }}-${{ github.ref }}
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
 
       - name: Setup Python
         uses: actions/setup-python@v5
         with:
           python-version: '3.12'
-
-      - name: Upgrade pip
-        run: python3 -m pip install --upgrade pip
-
-      - name: Get pip cache dir
-        id: pip-cache
-        run: echo "dir=$(pip cache dir)" >> $GITHUB_ENV
-
-      - name: Cache dependencies
-        uses: actions/cache@v4
-        with:
-          path: ${{ env.dir }}
-          key: ${{ runner.os }}-pip-${{ hashFiles('**/requirements.txt') }}
-          restore-keys: |
-            ${{ runner.os }}-pip-
+          cache: 'pip'
+          cache-dependency-path: '**/requirements.txt'
 
       - name: Install dependencies
         run: |
+          python -m pip install --upgrade pip
           pip install .[docs]
 
       - run: mkdocs build