frankenphp: break loop when loopMax is reached (#174)

Fixes the issue that the loop doesn't exist when `$loopMax` is reached,
but `$loopMax+1`. Please refer to
php-runtime/runtime#173 for details.

src/Runner.php

@@ -49,7 +49,7 @@ public function run(): int
             }
 
             gc_collect_cycles();
-        } while ($ret && (-1 === $this->loopMax || ++$loops <= $this->loopMax));
+        } while ($ret && (-1 === $this->loopMax || ++$loops < $this->loopMax));
 
         return 0;
     }