NewRelic supports PHP 8.3.

[damienmckenna]

Closes #8840.

Summary

Updates https://docs.pantheon.io/guides/php to remove the warning about NewRelic and PHP 8.3.

Effect

The following changes are already committed:

• Updates https://docs.pantheon.io/guides/php to remove the warning about NewRelic and PHP 8.3.

Dependencies and Timing

• [ ] NewRelic client upgraded to v10.15.04

Release:

• [ ] When ready
• [ ] After date: $DATE

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Post Launch

Do not remove - To be completed by the docs team upon merge:

• [ ] Redirect /old-path/ => /new-path/ (if applicable)
• [ ] Include/exclude pages ^ respectively within docs search service provider (if applicable)
• [ ] For Heroes - add a props post to the discussion board.
• [ ] Remove from the project board