chore: include PYTHON_311 runtime in aws-apprunner-alpha

[hiselitelordship]

Reason for this change

Apprunner supports two Python Runtimes: 3 and 311 as documented here: https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-properties-apprunner-service-codeconfigurationvalues.html

Python 3.11 not present in aws-apprunner-alpha runtime values.

Description of changes

Add PYTHON_311 to available list of runtimes:
public static readonly PYTHON_311 = Runtime.of('PYTHON_311')

Description of how you validated changes

No unit tests. This is a direct copy of the PYTHON_3 readonly property. Confirmed that there was nothing to do in the adjacent public static of function.

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]

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✅ Updated pull request passes all PRLinter validations. Dismissing previous PRLinter review.

[TheRealAmazonKendra]

Looks good!

[mergify]

Thank you for contributing! Your pull request will be updated from main and then merged automatically (do not update manually, and be sure to allow changes to be pushed to your fork).

[mergify]

Thank you for contributing! Your pull request will be updated from main and then merged automatically (do not update manually, and be sure to allow changes to be pushed to your fork).

[aws-cdk-automation]

This PR has been in the CHANGES REQUESTED state for 3 weeks, and looks abandoned. To keep this PR from being closed, please continue work on it. If not, it will automatically be closed in a week.

[aws-cdk-automation]

This PR has been deemed to be abandoned, and will be automatically closed. Please create a new PR for these changes if you think this decision has been made in error.

[paulhcsun]

@Mergifyio update

Pull request has been modified.

[mergify]

update

☑️ Nothing to do

• #commits-behind>0 [📌 update requirement]
• -closed [📌 update requirement]
• -conflict [📌 update requirement]
• queue-position=-1 [📌 update requirement]

[aws-cdk-automation]

AWS CodeBuild CI Report

• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: 9b52acd
• Result: SUCCEEDED
• Build Logs (available for 30 days)

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[mergify]

Thank you for contributing! Your pull request will be updated from main and then merged automatically (do not update manually, and be sure to allow changes to be pushed to your fork).

[TheRealAmazonKendra]

Not sure what happened here with mergify but there was a PR submitted just prior to this one with the same addition. We prioritize the earlier change in situations like this so I'll be closing this one in favor of #30149

[github-actions]

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