Aws-sdk-js: Appsync updateApiKey does not update

[upputa1]

Confirm by changing [ ] to [x] below to ensure that it's a bug:

• [X] I've gone through Developer Guide and API reference
• [X] I've checked AWS Forums and StackOverflow for answers
• [X] I've searched for previous similar issues and didn't find any solution

Describe the bug
NodeJs Appsync updateApiKey does not update api key expiration date, does not print any response
Is the issue in the browser/Node.js?
In Node.js
If on Node.js, are you running this on AWS Lambda?
Yes
Details of the browser/Node.js version
Node.js 12.x runtime Lambda
SDK version number
: v2.762.0

To Reproduce (observed behavior)
```const AWS = require('aws-sdk');
const moment = require('moment');

exports.lambdaHandler = async() => {
const apiId = process.env.apiId;
const appsync = new AWS.AppSync();
const region = process.env.AWS_REGION;

appsync.config.update({ region });

try {
const listParams = {
apiId
};
const response = await appsync.listApiKeys(listParams).promise();
const apiKeys = response.apiKeys;
console.log(apiKeys);
if (apiKeys && apiKeys.length) {
apiKeys.forEach(async(apiKey) => {
console.log('before', apiKey);
apiKey.expires = moment().add(1, 'month').unix();
apiKey.apiId = apiId;
console.log('modifed', apiKey);

    try {
      const updateResponse = await appsync.updateApiKey(apiKey).promise();
      console.info("Update response ", updateResponse)
    } catch (e) {
      console.error(e);
    }
  });
}

} catch (err) {
console.error(err);
throw err;
}
};

**Expected behavior**
I expect console.log to show the updated response. None is printed. I expect api key to have extended expiration.  
But if I try the same with aws cli with the printed values from "modified" in the logs, aws cli works perfectly. `appsync.updateApiKey` should behave the same.

aws appsync update-api-key --api-id=ffpvhmz6ybeijdh7sezayginzi --id=da2-fg6775vnd5cw7azxg6jvkaow3m --expires=1633182812
```

[upputa1]

This is not a bug. This is due to my incomplete knowledge of nodejs. Replacing forEach with for-loop, my lambda works. Thanks!!