Bump actions/cache from 3.2.6 to 3.3.1 (#336)

.github/workflows/tests.yaml

@@ -47,7 +47,7 @@ jobs:
           pip install -U setuptools
           python -m pip install -U pip
       - name: cache mypy
-        uses: actions/cache@69d9d449aced6a2ede0bc19182fadc3a0a42d2b0
+        uses: actions/cache@88522ab9f39a2ea568f7027eddc7d8d8bc9d59c8
         with:
           path: ./.mypy_cache
           key: mypy|${{ matrix.python }}|${{ hashFiles('pyproject.toml') }}