Build/Test Tools: Add a scoped Composer exception for the WPCS security advisory to unblock CI on the 6.9 branch.

[lancewillett]

Trac ticket: https://core.trac.wordpress.org/ticket/65739

This adds a scoped Composer audit exception for GHSA-3pwp-g2mj-5p3v to unblock dependency installation on the 6.9 branch.

It keeps WPCS at 3.2.0 and avoids introducing a broad coding-standards delta on the release branch.

Testing

• composer validate passed, with the existing version-field warning.
• A fresh composer install resolved WPCS 3.2.0.
• composer lint:errors could not complete under PHP 8.4.20 because PHPCS 3.13.2 raised a ValueError before producing results.

[lancewillett]

This and #12741 are a draft because I don't know the core philosophy (yet) around dependencies with security advisories, when the action to update would trigger a whole range of new issues to fix (code sniffs).

[github-actions]

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[github-actions]

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