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

Dumper/AbstractDumper.php

@@ -70,7 +70,7 @@ public function setOutput($output)
             $this->lineDumper = $output;
         } else {
             if (\is_string($output)) {
-                $output = fopen($output, 'wb');
+                $output = fopen($output, 'w');
             }
             $this->outputStream = $output;
             $this->lineDumper = [$this, 'echoLine'];
@@ -128,7 +128,7 @@ public function dump(Data $data, $output = null)
         }
 
         if ($returnDump = true === $output) {
-            $output = fopen('php://memory', 'r+b');
+            $output = fopen('php://memory', 'r+');
         }
         if ($output) {
             $prevOutput = $this->setOutput($output);

Dumper/CliDumper.php

@@ -538,7 +538,7 @@ protected function supportsColors()
         }
 
         $h = stream_get_meta_data($this->outputStream) + ['wrapper_type' => null];
-        $h = 'Output' === $h['stream_type'] && 'PHP' === $h['wrapper_type'] ? fopen('php://stdout', 'wb') : $this->outputStream;
+        $h = 'Output' === $h['stream_type'] && 'PHP' === $h['wrapper_type'] ? fopen('php://stdout', 'w') : $this->outputStream;
 
         return static::$defaultColors = $this->hasColorSupport($h);
     }

Tests/Dumper/CliDumperTest.php

@@ -320,7 +320,7 @@ public function testFlags()
      */
     public function testThrowingCaster()
     {
-        $out = fopen('php://memory', 'r+b');
+        $out = fopen('php://memory', 'r+');
 
         require_once __DIR__.'/../Fixtures/Twig.php';
         $twig = new \__TwigTemplate_VarDumperFixture_u75a09(new Environment(new FilesystemLoader()));

Tests/Dumper/HtmlDumperTest.php

@@ -141,7 +141,7 @@ public function testCharset()
 
     public function testAppend()
     {
-        $out = fopen('php://memory', 'r+b');
+        $out = fopen('php://memory', 'r+');
 
         $dumper = new HtmlDumper();
         $dumper->setDumpHeader('<foo></foo>');

composer.json

@@ -24,7 +24,7 @@
         "ext-iconv": "*",
         "symfony/console": "^4.4|^5.0",
         "symfony/process": "^4.4|^5.0",
-        "twig/twig": "^2.4|^3.0"
+        "twig/twig": "^2.13|^3.0.4"
     },
     "conflict": {
         "phpunit/phpunit": "<5.4.3",