Fix deprecated set-output for pip-cache in GHA jobs

See:
- https://github.blog/changelog/2022-10-11-github-actions-deprecating-save-state-and-set-output-commands/
- https://github.com/actions/setup-python#caching-packages-dependencies
- https://github.com/actions/setup-python/blob/main/docs/advanced-usage.md#caching-packages

Author: bittner

.github/workflows/release.yml

@@ -23,19 +23,9 @@ jobs:
         uses: actions/setup-python@v5
         with:
           python-version: '3.12'
-
-      - name: Get pip cache dir
-        id: pip-cache
-        run: |
-          echo "::set-output name=dir::$(pip cache dir)"
-
-      - name: Cache
-        uses: actions/cache@v4
-        with:
-          path: ${{ steps.pip-cache.outputs.dir }}
-          key: release-${{ hashFiles('**/setup.py') }}
-          restore-keys: |
-            release-
+          cache: pip
+          cache-dependency-path: |
+            **/pyproject.toml
 
       - name: Install dependencies
         run: |

.github/workflows/test.yml

@@ -39,20 +39,9 @@ jobs:
       uses: actions/setup-python@v5
       with:
         python-version: ${{ matrix.python-version }}
-
-    - name: Get pip cache dir
-      id: pip-cache
-      run: |
-        echo "::set-output name=dir::$(pip cache dir)"
-
-    - name: Cache
-      uses: actions/cache@v4
-      with:
-        path: ${{ steps.pip-cache.outputs.dir }}
-        key:
-          ${{ matrix.python-version }}-v1-${{ hashFiles('**/pyproject.toml') }}
-        restore-keys: |
-          ${{ matrix.python-version }}-v1-
+        cache: pip
+        cache-dependency-path: |
+          **/pyproject.toml
 
     - name: Install dependencies
       run: |