Merge branch '3.x' into 4.x

* 3.x:
  Remove obsolete code
  Deprecate Environment::mergeGlobals()
  Bump version
  Prepare the 3.13.0 release
  Fix wrong format of `Environment::VERSION_ID` constant
  Fix minor things
  Fix CS
  Fix isset in ForLoopNode
  Fix iterable return type
  Improve exception expectations reliability

src/Util/ReflectionCallable.php

@@ -25,7 +25,7 @@ final class ReflectionCallable
     private string $name;
 
     public function __construct(
-        private TwigCallableInterface $twigCallable,
+        TwigCallableInterface $twigCallable,
     ) {
         $callable = $twigCallable->getCallable();
         if (\is_string($callable) && false !== $pos = strpos($callable, '::')) {