[php-src] PR #24354: Fix GH-24350: Stale external tz database read after module restart

Pull Request: https://github.com/php/php-src/pull/24354 Author: lazerg PHP_MINIT_FUNCTION(date) registered its INI entries before resetting php_date_global_timezone_db. Registering date.timezone runs OnUpdate_date_timezone(), which checks the value against DATE_TIMEZONEDB. On an in-process engine restart (Apache graceful reload, FrankenPHP worker restart), that pointer still points into the PECL timezonedb .so that the previous shutdown unloaded, so startup reads unmapped memory and crashes in seek_to_tz_position(). The reset now happens before REGISTER_INI_ENTRIES(). I checked it with a small embed host on macOS: it loads timezonedb as a shared extension, calls php_embed_init()/php_embed_shutdown() twice, and maps a PROT_NONE region over the address range the unloaded .so used. Before the fix, the second startup crashes in seek_to_tz_position(). After the fix, it starts normally and still uses the external database. There is no test, because run-tests cannot restart the engine inside one process. Fixes GH-24350