update to PHP 8.3

[JonathanMatthey]

PR Checklist

• Linked issue added (e.g., Fixes #123)
• If styles were updated:
  • Stylesheet version has been bumped

Summary

[JoblersTune]

What command did you run to generate these file changes?

If you update the PHP version inside the Docker environment or your local machine, do you see any issues?

I.e. docker/Dockerfile
FROM php:8.2-apache AS dev should be updated to test