Updated all dependencies and prepared for PHP 8

classes/DI/WhitelistReflectionBasedAutowiring.php

@@ -16,7 +16,7 @@ use DI\Definition\Source\DefinitionSource, DI\Definition\Source\Autowiring,
  */
 class WhitelistReflectionBasedAutowiring extends ReflectionBasedAutowiring implements DefinitionSource, Autowiring {
 
-    public function autowire(string $name, ObjectDefinition $definition = null) {
+    public function autowire(string $name, ?ObjectDefinition $definition = null) : ?ObjectDefinition {
         return isset($definition) ? parent::autowire($name, $definition) : null;
     }