Bump actions/upload-artifact from 5.0.0 to 6.0.0 (#727)

Author: dependabot[bot]

.github/workflows/ci.yaml

@@ -81,7 +81,7 @@ jobs:
           echo "ref: $ref"
           echo "$ref" >> cleanup_cache
       - name: Upload cleanup-cache artifact
-        uses: actions/upload-artifact@v5.0.0
+        uses: actions/upload-artifact@v6.0.0
         with:
           name: cleanup_cache
           path: cleanup_cache