[php-src] PR #23395: ext/zip: Change return type of zip_entry_close() to true

Pull Request: https://github.com/php/php-src/pull/23395 Author: lacatoire zip_entry_close() is declared bool, but it has no failing return: invalid arguments and resources that are not zip entries throw, and zend_list_close() returns void, so the function always ends on RETURN_TRUE. zip_entry_open() is deliberately left alone: it ends on RETURN_BOOL(zr_rsrc->zf != NULL), which can genuinely be false, so bool is right there. zip_close() is already void. true being a subtype of bool, the only observable change is what Reflection reports. The added test pins both return types so the distinction is not flattened later.