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

Button.php

@@ -104,7 +104,7 @@ public function getParent(): ?FormInterface
      *
      * @throws BadMethodCallException
      */
-    public function add(string|FormInterface $child, string $type = null, array $options = []): static
+    public function add(string|FormInterface $child, ?string $type = null, array $options = []): static
     {
         throw new BadMethodCallException('Buttons cannot have children.');
     }
@@ -335,7 +335,7 @@ public function isRoot(): bool
         return null === $this->parent;
     }
 
-    public function createView(FormView $parent = null): FormView
+    public function createView(?FormView $parent = null): FormView
     {
         if (null === $parent && $this->parent) {
             $parent = $this->parent->createView();

ButtonBuilder.php

@@ -53,7 +53,7 @@ public function __construct(?string $name, array $options = [])
      *
      * @throws BadMethodCallException
      */
-    public function add(string|FormBuilderInterface $child, string $type = null, array $options = []): never
+    public function add(string|FormBuilderInterface $child, ?string $type = null, array $options = []): never
     {
         throw new BadMethodCallException('Buttons cannot have children.');
     }
@@ -63,7 +63,7 @@ public function add(string|FormBuilderInterface $child, string $type = null, arr
      *
      * @throws BadMethodCallException
      */
-    public function create(string $name, string $type = null, array $options = []): never
+    public function create(string $name, ?string $type = null, array $options = []): never
     {
         throw new BadMethodCallException('Buttons cannot have children.');
     }