chore(deps): update actions/cache action to v4

Author: renovate[bot]

.github/workflows/test.yml

@@ -47,7 +47,7 @@ jobs:
         with:
           python-version: ${{ matrix.python-version }}
 
-      - uses: actions/cache@v3
+      - uses: actions/cache@v4
         id: pip-cache
         with:
           path: ~/.cache/pip