(aws_batch): The default value of Launch Template is default but should be latest

### Describe the bug

The property of Compute Environment > LaunchTemplateSpecification > Version is set by the module `aws-batch` as Default. But when I update the launch template with CDK. The module selects the first version not the latest

https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-properties-batch-computeenvironment-launchtemplatespecification.html

> The version number of the launch template, $Latest, or $Default.
> If the value is $Latest, the latest version of the launch template is used. If the value is $Default, the default version of the launch template is used.

### Expected Behavior

The Module `aws-batch` should set Compute Environment > LaunchTemplateSpecification > Version to `$Latest`

### Current Behavior

The property of Compute Environment > LaunchTemplateSpecification > Version is set by the module `aws-batch` as Default.

### Reproduction Steps

```
multipart_user_data = ec2.MultipartUserData()
with open(from_root("cdk", "constructs", "user_data_xray.txt")) as f:
user_data_xray_txt = f.read()
multipart_user_data.add_part(
ec2.MultipartBody.from_raw_body(
content_type='text/x-shellscript; charset="us-ascii"',
body=user_data_xray_txt,
)
)
launch_template = ec2.LaunchTemplate(
self,
"lt-" + proc_name,
launch_template_name="batch-ffmpeg-lt-" + proc_name,
user_data=multipart_user_data,
)
compute_environment = batch.ManagedEc2EcsComputeEnvironment(
self,
"batch-ec2-compute-environment-" + proc_name,
vpc=ec2_vpc,
images=[{"image": ec2_ami}],
instance_classes=batch_compute_instance_classes,
use_optimal_instance_classes=False,
update_to_latest_image_version=True,
instance_role=batch_compute_env_instance_role,
terminate_on_update=False,
launch_template=launch_template,
security_groups=[ec2_vpc_sg],
vpc_subnets=ec2_vpc_subnets,
spot=True,
spot_bid_percentage=100,
maxv_cpus=4096,
)
```

### Possible Solution

_No response_

### Additional Information/Context

_No response_

### CDK CLI Version

2.110.1 (build 0d37f0d)

### Framework Version

_No response_

### Node.js Version

v18.0.0

### OS

Macos

### Language

Python

### Language Version

_No response_

### Other information

_No response_

Start at the aws-batch module and the ManagedEc2EcsComputeEnvironment construct shown in the reproduction. Inspect the synthesized Compute Environment LaunchTemplateSpecification and its Version value, then check nearby tests if available. Done means the generated CloudFormation uses $Latest instead of the default launch-template version.

Written by the indexing model from the issue text.