Fix: Update since tag for wp_get_user_request()

[DarkMatter-999]

Trac ticket: https://core.trac.wordpress.org/ticket/65132

This PR corrects the @since annotation for wp_get_user_request() in src/wp-includes/user.php, updating it from 4.9.6 to 5.4.0.

The function wp_get_user_request_data() was renamed to wp_get_user_request() in WordPress 5.4.0 (changeset 47245), and the original function was deprecated. However, the docblock for wp_get_user_request() was not updated at the time and incorrectly stated that it was introduced in version 4.9.6.

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[nikunj8866]

LGTM!