fix: fix missing bash command on github actions

Signed-off-by: Fery Wardiyanto <[email protected]>

src/BrowserStack.php

@@ -195,7 +195,7 @@ public static function getDriverURL(): string
      */
     private static function isDirty(): bool
     {
-        return (bool) \exec('[[ -n `git status --porcelain` ]] && echo 1');
+        return \exec('git status --porcelain') !== '';
     }
 
     /**