Add pcntl extension

Signed-off-by: Felipe Sayão Lobato Abreu <github@mentordosnerds.com>

Author: coisa

composer.json

@@ -26,6 +26,7 @@
     },
     "require": {
         "php": "^8.3",
+        "ext-pcntl": "*",
         "psr/log": "^3.0"
     },
     "require-dev": {

src/Worker/Worker.php

@@ -35,6 +35,7 @@
 use function ob_start;
 use function pcntl_fork;
 use function posix_get_last_error;
+use function pcntl_waitpid;
 use function posix_kill;
 use function restore_error_handler;
 use function set_error_handler;