Script Modules: Guard setAccessible() calls behind PHP < 8.1 check

[ramonjd]

What?

Wraps the two ReflectionProperty/ReflectionMethod::setAccessible( true ) calls in lib/compat/wordpress-7.0/script-modules.php with a PHP_VERSION_ID < 80100 guard.

Follow-up to #77214. Fixes #78124.

Why?

As of PHP 8.1, private/protected members are accessible via reflection without calling setAccessible(), so the call is a no-op. PHP 8.5 deprecates it, emitting:

Method ReflectionMethod::setAccessible() is deprecated since 8.5, as it has no effect since PHP 8.1

…on every editor page load when WP_DEBUG is enabled on WP < 7.0 (where this polyfill runs).

How?

Guards each setAccessible( true ) call behind if ( PHP_VERSION_ID < 80100 ) so it only runs where it has an effect.

Testing Instructions

1. On PHP 8.5 with WP_DEBUG and WP_DEBUG_LOG enabled, on WP < 7.0 (so the polyfill path runs), edit any post.
2. Before this patch: deprecation notice referencing script-modules.php line 59 in the debug log.
3. After this patch: no deprecation notice; script module translations continue to work (verify via the steps in I18N: Polyfill script module translations for WordPress < 7.0 #77214).

Testing Instructions for Keyboard

No UI changes — infrastructure-only.

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Co-authored-by: ramonjd <ramonopoly@git.wordpress.org>
Co-authored-by: t-hamano <wildworks@git.wordpress.org>
Co-authored-by: Presskopp <presskopp@git.wordpress.org>

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[t-hamano]

LGTM!

[ramonjd]

Thanks for the quick 👀 @t-hamano