Update codecov.yml

Co-authored-by: Simon Warta <[email protected]>

Author: uint

codecov.yml

@@ -26,7 +26,8 @@ flags:
     paths:
       - packages/schema/
   cosmwasm-schema-derive:
-    - packages/schema-derive/
+    paths:
+      - packages/schema-derive/
   cosmwasm-std:
     paths:
       - packages/std/