[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

tests/Alchemy/BinaryDriver/NONLTSProcessBuilderFactoryTest.php

@@ -0,0 +1,15 @@
+<?php
+
+namespace Alchemy\Tests\BinaryDriver;
+
+use Alchemy\BinaryDriver\ProcessBuilderFactory;
+
+class NONLTSProcessBuilderFactoryTest extends AbstractProcessBuilderFactoryTest
+{
+    protected function getProcessBuilderFactory($binary)
+    {
+        ProcessBuilderFactory::$emulateSfLTS = true;
+
+        return new ProcessBuilderFactory($binary);
+    }
+}