ci: use setup-python built-in caching

https://github.com/actions/setup-python#caching-packages-dependencies

Author: scop

.github/workflows/ci.yaml

@@ -14,10 +14,8 @@ jobs:
       - uses: actions/setup-python@v4
         with:
           python-version: ">=3.7"
-      - uses: actions/cache@v3
-        with:
-          path: ~/.cache/pip
-          key: pip-${{hashFiles('test/requirements*.txt')}}
+          cache: pip
+          cache-dependency-path: test/requirements*.txt
       - uses: actions/cache@v3
         with:
           path: ~/.cache/pre-commit