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Updates the bundled `php-ai-client` library to version 1.3.0 and aligns the WordPress-specific prompt builder (`WP_AI_Client_Prompt_Builder`) with the upstream changes. Key changes in php-ai-client 1.3.0: * Adds video generation model interfaces. * Enhances `PromptBuilder` with additional configuration methods. * Improves `TokenUsage` and `ProviderMetadata` DTOs. * Updates `MessagePart` DTO. See release: https://github.com/WordPress/php-ai-client/releases/tag/1.3.0 Developed in https://github.com/WordPress/wordpress-develop/pull/11219 Props flixos90. See #64591. Built from https://develop.svn.wordpress.org/trunk@61942 git-svn-id: http://core.svn.wordpress.org/trunk@61224 1a063a9b-81f0-0310-95a4-ce76da25c4cd