Update core.stub

Author: staabm

stubs/core.stub

@@ -338,6 +338,11 @@ function pcntl_signal(int $signal, $handler, bool $restart_syscalls = true): boo
  */
 function set_error_handler(?callable $callback, int $error_levels = E_ALL): ?callable {}
 
+/**
+ * @param-later-invoked-callable $callback
+ */
+function set_exception_handler(?callable $callback): ?callable {}
+
 /**
  * @param-later-invoked-callable $callback
  */