chore(deps): update actions/cache action to v5

Author: renovate[bot]

.github/workflows/tests.yml

@@ -20,15 +20,15 @@ jobs:
           cache: "pip"
 
       - name: Cache pip dependencies
-        uses: actions/cache@v4
+        uses: actions/cache@v5
         with:
           path: ~/.cache/pip
           key: ${{ runner.os }}-pip-${{ hashFiles('requirements.txt', 'pytest.ini') }}
           restore-keys: |
             ${{ runner.os }}-pip-
 
       - name: Cache pytest cache
-        uses: actions/cache@v4
+        uses: actions/cache@v5
         with:
           path: .pytest_cache
           key: ${{ runner.os }}-pytest-${{ github.sha }}