Bump actions/upload-artifact from 4.3.5 to 4.3.6 (#515)

Author: dependabot[bot]

.github/workflows/ci.yaml

@@ -77,7 +77,7 @@ jobs:
           echo "ref: $ref"
           echo "$ref" >> cleanup_cache
       - name: Upload cleanup-cache artifact
-        uses: actions/[email protected].5
+        uses: actions/[email protected].6
         with:
           name: cleanup_cache
           path: cleanup_cache