ci: fix deprecated input for codecov-action

Author: crazy-max

.github/workflows/test.yml

@@ -27,5 +27,5 @@ jobs:
         name: Upload coverage
         uses: codecov/codecov-action@v5
         with:
-          file: ./coverage/clover.xml
+          files: ./coverage/clover.xml
           token: ${{ secrets.CODECOV_TOKEN }}