Update .github/workflows/ci.yml

Author: JamesWrigley

.github/workflows/ci.yml

@@ -58,7 +58,7 @@ jobs:
       - uses: julia-actions/julia-processcoverage@v1
       - uses: codecov/codecov-action@v5
         with:
-          file: lcov.info
+          files: lcov.info
           token: ${{ secrets.CODECOV_TOKEN }}
 
   docs: