Bump to PHP 8.3

https://www.php.net/supported-versions.php

November 23, 2023

docs/general/requirements.md

@@ -71,6 +71,7 @@ The following recommendations relate to the CiviCRM core codebase. CiviCRM nativ
 
 | | CiviCRM 5.63 ESR | CiviCRM 5.x.x stable |
 | ---- | ---- | ---- |
+| PHP 8.3 | **not compatible.** You can support this effort [by fixing open issues](https://lab.civicrm.org/dev/core/-/issues/?sort=created_date&state=opened&label_name[]=php8%2B) or with [funding](https://civicrm.org/contribute) | **not compatible.** You can support this effort [by fixing open issues](https://lab.civicrm.org/dev/core/-/issues/?sort=created_date&state=opened&label_name[]=php8%2B) or with [funding](https://civicrm.org/contribute) |
 | PHP 8.2 | **not compatible.** You can support this effort [by fixing open issues](https://lab.civicrm.org/dev/core/-/issues/?sort=created_date&state=opened&label_name[]=php8%2B) or with [funding](https://civicrm.org/contribute) | **not compatible.** You can support this effort [by fixing open issues](https://lab.civicrm.org/dev/core/-/issues/?sort=created_date&state=opened&label_name[]=php8%2B) or with [funding](https://civicrm.org/contribute) |
 | PHP 8.1 | **compatible and recommended**. | **compatible and recommended**. |
 | PHP 8.0 | compatible but **not recommended** due to [PHP end-of life](http://php.net/eol.php) in Nov 2023 | compatible but **not recommended** due to [PHP end-of life](http://php.net/eol.php) in Nov 2023 |