Amazon Connect: list_users() does not return LastModifiedTime

[electronicalias]

Describe the bug

When trying to list the users in an instance, we do not get values back for LastModifiedTime.

Expected Behavior

As per the documentation the following should be returned:

{
    'UserSummaryList': [
        {
            'Id': 'string',
            'Arn': 'string',
            'Username': 'string',
            'LastModifiedTime': datetime(2015, 1, 1),
            'LastModifiedRegion': 'string'
        },
    ],
    'NextToken': 'string'
}

Current Behavior

The following is returned whether or not the user has been modified - we would expect LastModiedTime to contain the time created if the user has not been modified, like many other services:

{
    'UserSummaryList': [
        {
            "Id": "our id", 
            "Arn": "our data", 
            "Username": "our user"
         },
    ],
    'NextToken': 'string'
}

### Reproduction Steps

Run the following in any Lambda/Python function:

```python
connect_client = boto3.client('connect')
response = connect_client.list_users(
        InstanceId=instance_id
)

Possible Solution

Always return LastModifiedTime. Use the created value as LastModifiedTime if there is no modifications made.

Additional Information/Context

No response

SDK version used

1.28.83

Environment details (OS name and version, etc.)

Lambda Python 3.8 x86_64

[RyanFitzSimmonsAK]

Hi @electronicalias, thanks for reaching out. I was not able to reproduce this behavior on the most recent version of Boto3. LastModifiedTime and LastModifiedRegion were only added recently, so I suspect this is an issue of versions. Can you confirm that the Boto3 and Botocore versions that your Lambda function are using is 1.28.76 or higher? By default, Lambda environments are packaged with a much older version of the SDK that won't have the recent model updates.

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[electronicalias]

Confirm it's good, thank you.

[github-actions]

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