ci(dependabot): bump actions/cache from 2 to 4

Bumps [actions/cache](https://github.com/actions/cache) from 2 to 4.
- [Release notes](https://github.com/actions/cache/releases)
- [Changelog](https://github.com/actions/cache/blob/main/RELEASES.md)
- [Commits](actions/cache@v2...v4)

---
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/ci.yml

@@ -64,7 +64,7 @@ jobs:
       run: |
         python -m pip install --upgrade pip
         pip install .[test]
-    - uses: actions/cache@v2
+    - uses: actions/cache@v4
       id: cache
       with:
         path: bioio_nd2/tests/resources