v1.9.0

• Feature / Fix: Forward compatibility with Promise v3.
  (#56 by @SimonFrings)

• Feature: Full PHP 8.3 compatibility.
  (#54 by @yadaiio)

• Minor documentation improvements.
  (#53 and #55 by @yadaiio)

• Update test suite to use new reactphp/async package instead of clue/reactphp-block.
  (#50 and #57 by @dinooo13 and @SimonFrings)