Merge branch '6.4' into 7.0

* 6.4:
  Fix implicitly-required parameters
  minor #53524 [Messenger] [AmazonSqs] Allow `async-aws/sqs` version 2 (smoench)
  Fix bad merge
  List CS fix in .git-blame-ignore-revs
  Fix implicitly-required parameters
  List CS fix in .git-blame-ignore-revs
  Apply php-cs-fixer fix --rules nullable_type_declaration_for_default_null_value
  [Messenger][AmazonSqs] Allow async-aws/sqs version 2

Author: nicolas-grekas

Exception/FileNotFoundException.php

@@ -19,7 +19,7 @@
  */
 class FileNotFoundException extends IOException
 {
-    public function __construct(string $message = null, int $code = 0, \Throwable $previous = null, string $path = null)
+    public function __construct(?string $message = null, int $code = 0, ?\Throwable $previous = null, ?string $path = null)
     {
         if (null === $message) {
             if (null === $path) {

Exception/IOException.php

@@ -22,7 +22,7 @@ class IOException extends \RuntimeException implements IOExceptionInterface
 {
     private ?string $path;
 
-    public function __construct(string $message, int $code = 0, \Throwable $previous = null, string $path = null)
+    public function __construct(string $message, int $code = 0, ?\Throwable $previous = null, ?string $path = null)
     {
         $this->path = $path;
 

Filesystem.php

@@ -125,7 +125,7 @@ public function exists(string|iterable $files): bool
      *
      * @throws IOException When touch fails
      */
-    public function touch(string|iterable $files, int $time = null, int $atime = null): void
+    public function touch(string|iterable $files, ?int $time = null, ?int $atime = null): void
     {
         foreach ($this->toIterable($files) as $file) {
             if (!($time ? self::box('touch', $file, $time, $atime) : self::box('touch', $file))) {
@@ -508,7 +508,7 @@ public function makePathRelative(string $endPath, string $startPath): string
      *
      * @throws IOException When file type is unknown
      */
-    public function mirror(string $originDir, string $targetDir, \Traversable $iterator = null, array $options = []): void
+    public function mirror(string $originDir, string $targetDir, ?\Traversable $iterator = null, array $options = []): void
     {
         $targetDir = rtrim($targetDir, '/\\');
         $originDir = rtrim($originDir, '/\\');

Path.php

@@ -254,7 +254,7 @@ public static function getRoot(string $path): string
      * @param string|null $extension if specified, only that extension is cut
      *                               off (may contain leading dot)
      */
-    public static function getFilenameWithoutExtension(string $path, string $extension = null): string
+    public static function getFilenameWithoutExtension(string $path, ?string $extension = null): string
     {
         if ('' === $path) {
             return '';