Update cache action version in tests workflow to v5.0.5

Author: paxnovem

.github/workflows/tests.yaml

@@ -47,7 +47,7 @@ jobs:
           cache: pip
           cache-dependency-path: requirements*/*.txt
       - name: cache mypy
-        uses: actions/cache@0c45773b623bea8c8e75f6c82b208c3cf94ea4f9 # v4.0.2
+        uses: actions/cache@27d5ce7f107fe9357f9df03efb73ab90386fccae # v5.0.5
         with:
           path: ./.mypy_cache
           key: mypy|${{ hashFiles('pyproject.toml') }}