Bump actions/cache from 3.2.6 to 4.0.0

Bumps [actions/cache](https://github.com/actions/cache) from 3.2.6 to 4.0.0.
- [Release notes](https://github.com/actions/cache/releases)
- [Changelog](https://github.com/actions/cache/blob/main/RELEASES.md)
- [Commits](actions/cache@v3.2.6...v4.0.0)

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

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

.github/workflows/linting_testing.yml

@@ -64,7 +64,7 @@ jobs:
       #----------------------------------------------
       - name: Load cached venv
         id: cached-poetry-dependencies
-        uses: actions/cache@v3.2.6
+        uses: actions/cache@v4.0.0
         with:
           path: .venv
           key: venv-${{ runner.os }}-${{ hashFiles('**/poetry.lock') }}