fix: set the correct port for the SES SMTP servie endpoint

[johnf]

Issue # (if applicable)

I didn't create an issue went stright to PR

Reason for this change

const sesEndpoint = new ec2.InterfaceVpcEndpoint(this, 'SESEndpoint', {
  service: ec2.InterfaceVpcEndpointAwsService.EMAIL_SMTP,
  vpc,
  subnets: {
    subnets,
  },
});

The endpoint helper automatically creates a security group with port 443.
The EMAIL_SMPT helper should set this to 587

Description of changes

I've updated the definition to pass in the correct port overriding the default.

I've worked around this in my own code by not using the predefined helper

Describe any new or updated permissions being added

N/A

Description of how you validated changes

Tested by hand

Checklist

• My code adheres to the CONTRIBUTING GUIDE and DESIGN GUIDELINES

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

[aws-cdk-automation]

The pull request linter fails with the following errors:

❌ Fixes must contain a change to a test file.
❌ Fixes must contain a change to an integration test file and the resulting snapshot.

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[aws-cdk-automation]

AWS CodeBuild CI Report

• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: ed2635a
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