📌 N°4284 Composer libs : fix twig/twig to ~1.42.5

Without specifying explicitly the Twig version, since the update of require php from 5.6 to 7.0 we are getting Twig 2.12.5 !
We don't want Twig 2 as this version changes the macro scope and causes massive changes in our code... This update will be done later in other branches.

lib/autoload.php

@@ -2,6 +2,11 @@
 
 // autoload.php @generated by Composer
 
+if (PHP_VERSION_ID < 50600) {
+    echo 'Composer 2.3.0 dropped support for autoloading on PHP <5.6 and you are running '.PHP_VERSION.', please upgrade PHP or use Composer 2.2 LTS via "composer self-update --2.2". Aborting.'.PHP_EOL;
+    exit(1);
+}
+
 require_once __DIR__ . '/composer/autoload_real.php';
 
 return ComposerAutoloaderInit0018331147de7601e7552f7da8e3bb8b::getLoader();