Apply suggestion from @odow

Author: odow

.github/workflows/ci.yml

@@ -50,5 +50,5 @@ jobs:
       - uses: julia-actions/julia-processcoverage@v1
       - uses: codecov/codecov-action@v6
         with:
-          file: lcov.info
+          files: lcov.info
           token: ${{ secrets.CODECOV_TOKEN }}