[BC] Upgraded dependencies, dropped support for anything below PHP 8.0. (#849)

* GitHub actions + style fixes + updated packages

* Fixed workflows dir

* Support for PHP 8.1 (#1)

* Update README.md

* Revert some changes from upstream

src/FFMpeg/Format/Audio/Aac.php

@@ -12,7 +12,7 @@
 namespace FFMpeg\Format\Audio;
 
 /**
- * The AAC audio format
+ * The AAC audio format.
  */
 class Aac extends DefaultAudio
 {
@@ -26,6 +26,6 @@ class Aac extends DefaultAudio
      */
     public function getAvailableAudioCodecs()
     {
-        return array('libfdk_aac');
+        return ['libfdk_aac'];
     }
 }