Bump actions/download-artifact from 7 to 8 (#12543)

Bumps [actions/download-artifact](https://github.com/actions/download-artifact) from 7 to 8.
- [Release notes](https://github.com/actions/download-artifact/releases)
- [Commits](https://github.com/actions/download-artifact/compare/v7...v8)

---
updated-dependencies:
- dependency-name: actions/download-artifact
  dependency-version: '8'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

.github/workflows/build_orca.yml

@@ -132,7 +132,7 @@ jobs:
 
       - name: Download macOS app bundles
         if: runner.os == 'macOS' && inputs.macos-combine-only
-        uses: actions/download-artifact@v7
+        uses: actions/download-artifact@v8
         with:
           pattern: OrcaSlicer_Mac_bundle_*_${{ github.sha }}
           path: ${{ github.workspace }}/mac_bundles