build(deps): bump actions/cache from 3 to 4 (#23)

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]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

action.yml

@@ -126,7 +126,7 @@ runs:
     - name: Cache executables
       if: inputs.cache == 'true'
       id: cache-modflow
-      uses: actions/cache@v3
+      uses: actions/cache@v4
       with:
         path: ${{ env.MODFLOW_BIN_PATH }}
         key: ${{ steps.cache-key.outputs.key }}