fix(stubs): mark parameters as explicitly nullable

Author: msbit

stubs/stream_socket_client.stub

@@ -8,9 +8,9 @@
  */
 function stream_socket_client(
     string $address,
-    int &$error_code = null,
-    string &$error_message = null,
-    float $timeout = null,
+    int|null &$error_code = null,
+    string|null &$error_message = null,
+    float|null $timeout = null,
     int $flags = STREAM_CLIENT_CONNECT,
     $context = null
 ) {

stubs/stream_socket_server.stub

@@ -8,8 +8,8 @@
  */
 function stream_socket_server(
     string $address,
-    int &$error_code = null,
-    string &$error_message = null,
+    int|null &$error_code = null,
+    string|null &$error_message = null,
     int $flags = STREAM_SERVER_BIND | STREAM_SERVER_LISTEN,
     $context = null
 ) {