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]>

.github/workflows/test-action.yml

@@ -32,7 +32,7 @@ jobs:
            echo "::set-output name=imagexz::$(basename "$(curl "https://downloads.raspberrypi.org/raspios_lite_armhf_latest" -s -L -I  -o /dev/null -w '%{url_effective}')")"
            echo "::set-output name=image::$(echo "$(basename "$(curl "https://downloads.raspberrypi.org/raspios_lite_armhf_latest" -s -L -I  -o /dev/null -w '%{url_effective}')")" | sed -e 's/.xz//')"
        - name: Cache Raspberry Pi OS 32bit image
-         uses: actions/cache@v3
+         uses: actions/cache@v4
          with:
            path: ${{ steps.setup.outputs.image }}
            key: ${{ steps.setup.outputs.image }}