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/ci.yml

@@ -57,13 +57,13 @@ jobs:
           password: ${{secrets.DOCKERHUB_TOKEN}}
 
       - name: Download ${{matrix.variant}} meta bake definition
-        uses: actions/download-artifact@v7
+        uses: actions/download-artifact@v8
         with:
           name: bake-meta-${{matrix.variant}}
           path: ${{ runner.temp }}/${{matrix.variant}}
 
       - name: Download ${{matrix.variant}} digests
-        uses: actions/download-artifact@v7
+        uses: actions/download-artifact@v8
         with:
           path: ${{ runner.temp }}/${{matrix.variant}}/digests
           pattern: digests-${{matrix.variant}}-*
@@ -381,7 +381,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Download Artifacts
-        uses: actions/download-artifact@v7
+        uses: actions/download-artifact@v8
         with:
           path: archive
           pattern: artifact-*