* 5.4:
  always pass microseconds to usleep as integers
  Bump Symfony version to 5.4.34
  Update VERSION for 5.4.33
  Update CONTRIBUTORS for 5.4.33
  Update CHANGELOG for 5.4.33

…null_value

* 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

* 5.4:
  [HttpClient] Fix pausing responses before they start when using curl
  separate child and parent context in NotificationEmail on writes
  do not overwrite the cache key when it is false
  [Mailer] Throw TransportException when unable to read from socket
  [Serializer] Rewrite `AbstractObjectNormalizer::createChildContext()` to use the provided `cache_key` from original context when creating child contexts
  [HttpClient] Fix error chunk creation in passthru
  Adjusting and removing the 'review' attribute from the pt_br translation XML.
  [Serializer] Take unnamed variadic parameters into account when denormalizing