Remove deprected code

src/Environment.php

@@ -808,16 +808,6 @@ class Environment
         return array_merge($this->extensionSet->getGlobals(), $this->globals);
     }
 
-    /**
-     * @deprecated since Twig 3.13
-     */
-    public function mergeGlobals(array $context): array
-    {
-        trigger_deprecation('twig/twig', '3.13', 'The "%s" method is deprecated.', __METHOD__);
-
-        return $context + $this->getGlobals();
-    }
-
     /**
      * @internal
      *