build(deps): 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](https://github.com/actions/cache/compare/v3...v4)

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

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

.github/workflows/pythonpackage.yml

@@ -32,7 +32,7 @@ jobs:
       run: |
         poetry config virtualenvs.create true --local
         poetry config virtualenvs.in-project true --local
-    - uses: actions/cache@v3
+    - uses: actions/cache@v4
       name: Define a cache for the virtual environment based on the dependencies lock file
       with:
         path: ./.venv