Fix the return type of mysqli::connect()

Author: kocsismate

ext/mysqli/mysqli.stub.php

@@ -54,7 +54,7 @@ public function close() {}
     public function commit(int $flags = 0, ?string $name = null) {}
 
     /**
-     * @return mysqli|null|false
+     * @return bool|null
      * @alias mysqli_connect
      * @no-verify
      */

ext/mysqli/mysqli_arginfo.h

@@ -1,5 +1,5 @@
 /* This is a generated file, edit the .stub.php file instead.
- * Stub hash: c2ab263780902447855ecb0d8a9e3432577a32d1 */
+ * Stub hash: 5a2483f099fbebc795747e3b51402b2194020743 */
 
 ZEND_BEGIN_ARG_WITH_RETURN_TYPE_MASK_EX(arginfo_mysqli_affected_rows, 0, 1, MAY_BE_LONG|MAY_BE_STRING)
 	ZEND_ARG_OBJ_INFO(0, mysql, mysqli, 0)