Amazon.CDK.AWS.Lex: Property that used to be untyped and is now typed is easy to misuse

### Describe the bug

It seems that there is a PascalCase / camelCase issue when deploying a new Lex Bot using the CfnBot class. There is a mandatory property called "DataPrivacy". This property must be of type "CfnBot.DataPrivacyProperty", which also contains a mandatory property called "ChildDirected". Even this property has been set to "true", when deploying the stack it throws an error like this:

UPDATE_ROLLBACK_COMPLETE: Properties validation failed for resource MyResourceA629FA55 with message:
[#/DataPrivacy: extraneous key [childDirected] is not permitted]

### Regression Issue

- [ ] Select this option if this issue appears to be a regression.

### Last Known Working CDK Version

_No response_

### Expected Behavior

It should deploy the Lex bot without any issues.

### Current Behavior

The deployment of the Lex bot is failing, so the entire changeset gets rolled back.

### Reproduction Steps

Define a CfnBot like this:

var bot = new CfnBot(this, $"{id}-{botName}", new CfnBotProps
{
Name = $"{botName}",
RoleArn = lexRole.RoleArn,
DataPrivacy = new CfnBot.DataPrivacyProperty
{
ChildDirected = false
},
IdleSessionTtlInSeconds = 300, // 5 minutes
Description = $"Bot for the {id} application.",
BotFileS3Location = new CfnBot.S3LocationProperty
{
S3Bucket = importBucket.BucketName,
S3ObjectKey = botKey,
}
});

### Possible Solution

Fix the JsiiProperty attribute of the property ChildDirected of the class Amazon.CDK.AWS.Lex.CfnBot.DataPrivacyProperty by changing its name from "childDirected" to "ChildDirected".

### Additional Information/Context

_No response_

### CDK CLI Version

2.1003.0 (build b242c23)

### Framework Version

.net 8

### Node.js Version

v20.9.0

### OS

Windows 11 23H2

### Language

.NET

### Language Version

_No response_

### Other information

_No response_

Start at Amazon.CDK.AWS.Lex.CfnBot.DataPrivacyProperty and inspect the JsiiProperty metadata for ChildDirected, comparing the generated .NET property name with the CloudFormation key in the deployment error. Locate the relevant CDK or jsii test fixture, then run the supplied CfnBot reproduction and verify deployment no longer reports childDirected as an extraneous key.

Written by the indexing model from the issue text.