skip transient test on GitHub Actions

Author: xabbuh

src/Symfony/Component/Process/Tests/ProcessTest.php

@@ -710,6 +710,9 @@ public function testProcessIsNotSignaled()
         if ('\\' === \DIRECTORY_SEPARATOR) {
             $this->markTestSkipped('Windows does not support POSIX signals');
         }
+        if (\PHP_VERSION_ID < 80300 && isset($_SERVER['GITHUB_ACTIONS'])) {
+            $this->markTestSkipped('Transient on GHA with PHP < 8.3');
+        }
 
         $process = $this->getProcess('echo foo');
         $process->run();