[WIP] Update composer.json dependencies to newer package versions

[Copilot]

• Update composer.json to change wordpress/abilities-api to ^0.3.0
• Update composer.json to use dev-trunk for wordpress/mcp-adapter from GitHub repository
• Test that composer install works with the new dependencies
• Verify the plugin still loads correctly with updated dependencies

Original prompt

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This section details on the original issue you should resolve

<issue_title>Update the composer.json dependancies to use newer version of certain packages</issue_title>
<issue_description>- wordpress/abilities-api: ^0.3.0

• wordpress/mcp-adapter use the latest trunk from https://github.com/WordPress/mcp-adapter</issue_description>

Comments on the Issue (you are @copilot in this section)

Fixes #7

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