Merge pull request #1056 from humanmade/issue-1836-add-support-for-php-8.4

Update docs to include PHP 8.4

Author: mikelittle

docs/specifications.md

@@ -7,7 +7,7 @@ order: 100
 
 The following versions are available, and the specific version in use will depend on your configuration.
 
-- PHP Version: 8.3, 8.2, 8.1, 8.0  see [Altis compatibility chart](docs://guides/updating-php/#altis-compatibility-chart)
+- PHP Version: 8.4, 8.3, 8.2, 8.1  see [Altis compatibility chart](docs://guides/updating-php/#altis-compatibility-chart)
 - MySQL Version: 8.0 (compatible; using AWS Aurora)
 
 ## PHP Modules