Bump actions/cache from 3 to 4

Bumps [actions/cache](https://github.com/actions/cache) from 3 to 4.
- [Release notes](https://github.com/actions/cache/releases)
- [Changelog](https://github.com/actions/cache/blob/main/RELEASES.md)
- [Commits](actions/cache@v3...v4)

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

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

.github/workflows/ci-tests.yml

@@ -55,7 +55,7 @@ jobs:
 
       - name: MyPy cache
         if: ${{ matrix.step == 'mypy' }}
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
           path: .mypy_cache/${{ env.py-semver }}
           key: mypy-${{ env.py-semver }}

.github/workflows/tag_to_publish.yml

@@ -28,7 +28,7 @@ jobs:
           python-version: 3.11
 
       - name: Cache for pip
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
           path: ~/.cache/pip
           key: ${{ runner.os }}-pip-release-${{ hashFiles('requirements.txt', 'test-requirements.txt') }}