Docs: Add missing `@deprecated` tags to PHP 4 constructors in `WP_Widget` and...

Docs: Add missing `@deprecated` tags to PHP 4 constructors in `WP_Widget` and `WP_Widget_Factory()`.

Correct version number in `_deprecated_constructor()` call in `WP_Widget_Factory()`, see [32990].

Props jrf.
See #48252.
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