Update .github/workflows/Downstream.yml

Author: ChrisRackauckas

.github/workflows/Downstream.yml

@@ -68,4 +68,4 @@ jobs:
       - uses: julia-actions/julia-processcoverage@v1
       - uses: codecov/codecov-action@v5
         with:
-          file: lcov.info
+          files: lcov.info