Switch static-php-cli to support PHP 8.3 and 8.4 only (#615)

* Update spc self to PHP 8.4 only

* Update workflows

* Fix test-extensions, adjust docs order

* Fix cs-fix and phpunit

* Add PHP_CS_FIXER_IGNORE_ENV

* Add compatibility for PHP 8.3

* Change version description in README, adjust composer.json PHP version limit

* Switch PHP to 8.4 in spc-alpine-docker

* Add deprecation notice

src/SPC/ConsoleApplication.php

@@ -32,7 +32,7 @@ use Symfony\Component\Console\Application;
  */
 final class ConsoleApplication extends Application
 {
-    public const VERSION = '2.4.5';
+    public const VERSION = '2.5.0';
 
     public function __construct()
     {

src/globals/test-extensions.php

@@ -163,6 +163,8 @@ if ($argv[1] === 'download_cmd') {
     } else {
         passthru('./bin/spc ' . $build_cmd . ' --build-embed', $retcode);
     }
+} else {
+    $retcode = 0;
 }
 
 exit($retcode);