set internal Translator to private and readonly

Signed-off-by: Thomas Müller <[email protected]>

src/Translator/Translator.php

@@ -11,7 +11,7 @@ final class Translator implements
     I18nTranslatorInterface,
     ValidatorTranslatorInterface
 {
-    public function __construct(protected I18nTranslatorInterface $translator)
+    public function __construct(private readonly I18nTranslatorInterface $translator)
     {
     }