Merge branch '4.4' into 5.2

* 4.4:
  [Config][DependencyInjection] Uniformize trailing slash handling
  [PropertyInfo] Make ReflectionExtractor correctly extract nullability
  [PropertyInfo] fix attribute namespace with recursive traits
  Check redis extension version
  [Security] Update Russian translations
  [VarExporter] Add support of PHP enumerations
  [Security] Added missing Japanese translations
  [Security] Added missing Polish translations
  [Security] Add missing Italian translations #41051
  [Security] Missing translations pt_BR
  getProtocolVersion may return null
  [Translation] Set default locale for IdentityTranslatorTest

Tests/IdentityTranslatorTest.php

@@ -23,6 +23,7 @@ protected function setUp(): void
         parent::setUp();
 
         $this->defaultLocale = \Locale::getDefault();
+        \Locale::setDefault('en');
     }
 
     protected function tearDown(): void