Bump actions/cache from 4.0.2 to 4.1.1

Bumps [actions/cache](https://github.com/actions/cache) from 4.0.2 to 4.1.1.
- [Release notes](https://github.com/actions/cache/releases)
- [Changelog](https://github.com/actions/cache/blob/main/RELEASES.md)
- [Commits](actions/cache@0c45773...3624ceb)

---
updated-dependencies:
- dependency-name: actions/cache
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/app-tests.yaml

@@ -81,7 +81,7 @@ jobs:
             npm install
             npm run build
         - name: cache mypy
-          uses: actions/cache@0c45773b623bea8c8e75f6c82b208c3cf94ea4f9 # v4.0.2
+          uses: actions/cache@3624ceb22c1c5a301c8db4169662070a689d9ea8 # v4.1.1
           with:
             path: ./.mypy_cache
             key: mypy${{ matrix.os }}-${{ matrix.python_version }}-${{ hashFiles('requirements-dev.txt', 'src/backend/requirements.txt', 'src/backend/pyproject.toml') }}