build(deps): bump actions/download-artifact from 7 to 8

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>

.github/workflows/maintenance-label-on-approval.yml

@@ -15,7 +15,7 @@ jobs:
 
     steps:
       - name: Download PR number artifact from upstream run
-        uses: actions/download-artifact@v7
+        uses: actions/download-artifact@v8
         with:
           name: pr-number-${{ github.event.workflow_run.id }}   # same unique name
           path: .

.github/workflows/maintenance-rewrite-kernel-configs.yml

@@ -181,7 +181,7 @@ jobs:
 
       - name: Download all change artifacts (no merge)
         continue-on-error: true
-        uses: actions/download-artifact@v7
+        uses: actions/download-artifact@v8
         with:
           path: _artifacts
           pattern: changes-*