[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/LTSProcessBuilderFactoryTest.php

@@ -0,0 +1,28 @@
+<?php
+
+namespace Alchemy\Tests\BinaryDriver;
+
+use Alchemy\BinaryDriver\ProcessBuilderFactory;
+
+class LTSProcessBuilderFactoryTest extends AbstractProcessBuilderFactoryTest
+{
+    public function setUp(): void
+    {
+        if (!class_exists('Symfony\Component\Process\ProcessBuilder')) {
+            $this->markTestSkipped('ProcessBuilder is not available.');
+            return;
+        }
+
+        parent::setUp();
+    }
+
+    protected function getProcessBuilderFactory($binary)
+    {
+        $factory = new ProcessBuilderFactory($binary);
+        $factory->setBuilder(new LTSProcessBuilder());
+        ProcessBuilderFactory::$emulateSfLTS = false;
+        $factory->useBinary($binary);
+
+        return $factory;
+    }
+}