update swoole version

Author: jingjingxyk

sapi/src/builder/extension/swoole.php

@@ -5,7 +5,7 @@
 
 return function (Preprocessor $p) {
 
-    $swoole_tag = 'v5.1.5';
+    $swoole_tag = 'v5.1.6';
     $file = "swoole-{$swoole_tag}.tar.gz";
 
     $url = "https://github.com/swoole/swoole-src/archive/refs/tags/{$swoole_tag}.tar.gz";