QL: run the QL-for-QL tests when a nested folder is changed

.github/workflows/ql-for-ql-tests.yml

@@ -4,11 +4,11 @@ on:
   push:
     branches: [main]
     paths:
-      - ql/*
+      - "ql/**"
   pull_request:
     branches: [main]
     paths:
-      - ql/*
+      - "ql/**"
 
 env:
   CARGO_TERM_COLOR: always