test(frontend): satisfy numeric separator lint rule

Author: gildesmarais

frontend/src/__tests__/useFeedConversion.contract.test.ts

@@ -137,7 +137,7 @@ describe('useFeedConversion contract', () => {
         );
         expect(result.current.result?.preview.isLoading).toBe(false);
       },
-      { timeout: 6_000 }
+      { timeout: 6000 }
     );
   });
 });