Merge branch '5.1' into 5.2

* 5.1:
  µCS fix
  CS fix
  CS fix
  [travis] use PHP 8.0 to patch return types and run deps=low
  Add me as a Notifier code owner
  Update sl_SI translations
  Don't trigger deprecation for deprecated aliases pointing to deprecated definitions
  [HttpFoundation] use atomic writes in MockFileSessionStorage
  Make EmailMessage & SmsMessage transport nullable
  remove unused argument
  [DI] fix param annotation
  [Config] Add \Symfony\Component\Config\Loader::load() return type
  Simplify PHP CS Fixer config
  Rename normalize param

Author: nicolas-grekas

Extension/DumpExtension.php

@@ -73,7 +73,7 @@ public function dump(Environment $env, array $context): ?string
             unset($vars[0], $vars[1]);
         }
 
-        $dump = fopen('php://memory', 'r+b');
+        $dump = fopen('php://memory', 'r+');
         $this->dumper = $this->dumper ?: new HtmlDumper();
         $this->dumper->setCharset($env->getCharset());
 

composer.json

@@ -19,7 +19,7 @@
         "php": ">=7.2.5",
         "symfony/polyfill-php80": "^1.15",
         "symfony/translation-contracts": "^1.1|^2",
-        "twig/twig": "^2.10|^3.0"
+        "twig/twig": "^2.13|^3.0.4"
     },
     "require-dev": {
         "egulias/email-validator": "^2.1.10",