test(api7): fix flaky test (#372)

Author: LiteSun

libs/backend-api7/e2e/support/global-setup.ts

@@ -9,6 +9,7 @@ const httpClient = axios.create({
   baseURL: 'https://localhost:7443',
   withCredentials: true,
   httpsAgent: new Agent({
+    keepAlive: false,
     rejectUnauthorized: false,
   }),
 });