Fix PHPCS issue for WP_Theme_JSON class

[mukeshpanchal27]

Trac ticket: https://core.trac.wordpress.org/ticket/62279

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[github-actions]

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[ramonjd]

PHP 8.4 / PHP 8.4 / MariaDB 11.2 multisite fails for me, but looks like a docker error, so not convinced it's related to these doc changes.

The PHP coding standards tests pass so LGTM

[SergeyBiryukov]

Thanks for the PR! Merged in r59328.