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

BinaryFileResponse.php

@@ -301,8 +301,8 @@ public function sendContent()
             return $this;
         }
 
-        $out = fopen('php://output', 'wb');
-        $file = fopen($this->file->getPathname(), 'rb');
+        $out = fopen('php://output', 'w');
+        $file = fopen($this->file->getPathname(), 'r');
 
         stream_copy_to_stream($file, $out, $this->maxlen, $this->offset);
 

Request.php

@@ -1546,7 +1546,7 @@ public function getContent(bool $asResource = false)
 
             $this->content = false;
 
-            return fopen('php://input', 'rb');
+            return fopen('php://input', 'r');
         }
 
         if ($currentContentIsResource) {

Session/Storage/MockFileSessionStorage.php

@@ -102,7 +102,10 @@ public function save()
 
         try {
             if ($data) {
-                file_put_contents($this->getFilePath(), serialize($data));
+                $path = $this->getFilePath();
+                $tmp = $path.bin2hex(random_bytes(6));
+                file_put_contents($tmp, serialize($data));
+                rename($tmp, $path);
             } else {
                 $this->destroy();
             }
@@ -122,8 +125,11 @@ public function save()
      */
     private function destroy(): void
     {
-        if (is_file($this->getFilePath())) {
+        set_error_handler(static function () {});
+        try {
             unlink($this->getFilePath());
+        } finally {
+            restore_error_handler();
         }
     }
 
@@ -140,8 +146,14 @@ private function getFilePath(): string
      */
     private function read(): void
     {
-        $filePath = $this->getFilePath();
-        $this->data = is_readable($filePath) && is_file($filePath) ? unserialize(file_get_contents($filePath)) : [];
+        set_error_handler(static function () {});
+        try {
+            $data = file_get_contents($this->getFilePath());
+        } finally {
+            restore_error_handler();
+        }
+
+        $this->data = $data ? unserialize($data) : [];
 
         $this->loadSession();
     }