Support for PHP 8.2

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**Tell us about your request**
Provide support for PHP 8.2. PHP 8.2 was released **over 1 year ago** (1 year 4 months) and is still not supported by App Runner. Active support for PHP 8.1 ends in **just 4 months**. For production use, we expect the platform to provide timely support for major releases.

**Describe alternatives you've considered**
When building from code, there is no managed support for this. The only option is PHP 8.1.

**Additional context**
Anything else we should know?

**Attachments**
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The issue names no files, tests, or entry points to inspect. Start by reviewing the App Runner roadmap request; done would mean managed App Runner support for PHP 8.2, but the implementation scope is not specified.

Written by the indexing model from the issue text.