Merge branch '5.4' into 6.3

* 5.4:
  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

Section.php

@@ -36,7 +36,7 @@ class Section
      * @param float|null $origin        Set the origin of the events in this section, use null to set their origin to their start time
      * @param bool       $morePrecision If true, time is stored as float to keep the original microsecond precision
      */
-    public function __construct(float $origin = null, bool $morePrecision = false)
+    public function __construct(?float $origin = null, bool $morePrecision = false)
     {
         $this->origin = $origin;
         $this->morePrecision = $morePrecision;

Stopwatch.php

@@ -61,7 +61,7 @@ public function getSections(): array
      *
      * @throws \LogicException When the section to re-open is not reachable
      */
-    public function openSection(string $id = null)
+    public function openSection(?string $id = null)
     {
         $current = end($this->activeSections);
 
@@ -100,7 +100,7 @@ public function stopSection(string $id)
     /**
      * Starts an event.
      */
-    public function start(string $name, string $category = null): StopwatchEvent
+    public function start(string $name, ?string $category = null): StopwatchEvent
     {
         return end($this->activeSections)->startEvent($name, $category);
     }

StopwatchEvent.php

@@ -42,7 +42,7 @@ class StopwatchEvent
      *
      * @throws \InvalidArgumentException When the raw time is not valid
      */
-    public function __construct(float $origin, string $category = null, bool $morePrecision = false, string $name = null)
+    public function __construct(float $origin, ?string $category = null, bool $morePrecision = false, ?string $name = null)
     {
         $this->origin = $this->formatTime($origin);
         $this->category = \is_string($category) ? $category : 'default';