!6764 【bluetooth】【monthly1018用例优化】解决用例crash问题

Merge pull request !6764 from 权力/cherry-pick-1669863049

communication/bluetooth_ble/src/main/js/test/BleGattManager.test.js

@@ -125,6 +125,7 @@ describe('bluetoothBLETest', function() {
         console.info('[bluetooth_js] gattClient connect' + ret)
         expect(ret).assertTrue();
         gattClient.disconnect();
+        await sleep(2000);
         await gattClient.off("BLEConnectionStateChange");
         done()
    })