Check for duplicate dependencies in CI

Author: aryaemami59

.github/workflows/test-reselect-codemods.yml

@@ -40,5 +40,8 @@ jobs:
       - name: Check formatting
         run: yarn format:check
 
+      - name: Check for duplicate dependencies
+        run: yarn dedupe --strategy highest --check
+
       - name: Run test suite
         run: yarn test