chore(ec2): add interface endpoint for Redshift Serverless (#31273)

### Issue # (if applicable)

None.

### Reason for this change

Amazon Redshift Serverless supports AWS PrivateLink at 8/30.

https://aws.amazon.com/jp/about-aws/whats-new/2024/08/amazon-redshift-serverless-aws-privatelink/

### Description of changes

I've added `redshift-serverless` and `redshift-serverless-fips`.

### Description of how you validated changes

I checked latest endpoint information.

```sh
$ aws ec2 describe-vpc-endpoint-services --filters Name=service-type,Values=Interface Name=owner,Values=amazon --region us-east-1 --query ServiceNames | grep redshift
    "com.amazonaws.us-east-1.redshift",
    "com.amazonaws.us-east-1.redshift-data",
    "com.amazonaws.us-east-1.redshift-data-fips",
    "com.amazonaws.us-east-1.redshift-fips",
    "com.amazonaws.us-east-1.redshift-serverless", // newly added
    "com.amazonaws.us-east-1.redshift-serverless-fips", // newly added
```

### Checklist
- [x] My code adheres to the [CONTRIBUTING GUIDE](https://github.com/aws/aws-cdk/blob/main/CONTRIBUTING.md) and [DESIGN GUIDELINES](https://github.com/aws/aws-cdk/blob/main/docs/DESIGN_GUIDELINES.md)

----

*By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license*

Author: badmintoncryer

packages/aws-cdk-lib/aws-ec2/lib/vpc-endpoint.ts

@@ -515,6 +515,8 @@ export class InterfaceVpcEndpointAwsService implements IInterfaceVpcEndpointServ
   public static readonly REDSHIFT_FIPS = new InterfaceVpcEndpointAwsService('redshift-fips');
   public static readonly REDSHIFT_DATA = new InterfaceVpcEndpointAwsService('redshift-data');
   public static readonly REDSHIFT_DATA_FIPS = new InterfaceVpcEndpointAwsService('redshift-data-fips');
+  public static readonly REDSHIFT_SERVERLESS = new InterfaceVpcEndpointAwsService('redshift-serverless');
+  public static readonly REDSHIFT_SERVERLESS_FIPS = new InterfaceVpcEndpointAwsService('redshift-serverless-fips');
   public static readonly REKOGNITION = new InterfaceVpcEndpointAwsService('rekognition');
   public static readonly REKOGNITION_FIPS = new InterfaceVpcEndpointAwsService('rekognition-fips');
   public static readonly REKOGNITION_STREAMING = new InterfaceVpcEndpointAwsService('streaming-rekognition');