Update GitHub Artifact Actions

Author: renovate[bot]

.github/workflows/ci.yml

@@ -237,7 +237,7 @@ jobs:
           digest="${{ steps.build.outputs.digest }}"
           touch "/tmp/digests/${digest#sha256:}"
 
-      - uses: actions/upload-artifact@v6.0.0
+      - uses: actions/upload-artifact@v7.0.0
         if: ${{ github.event_name != 'pull_request' }}
         with:
           name: digests-${{ matrix.mcarch }}
@@ -258,7 +258,7 @@ jobs:
       - docker_build
     steps:
       - name: Download digests
-        uses: actions/download-artifact@v7.0.0
+        uses: actions/download-artifact@v8.0.0
         with:
           path: /tmp/digests
           pattern: digests-*