composer下載時報錯 Your requirements could not be resolved to an installable set of packages

問題描述：tp5.1 在使用 composer 下載 驗證碼的時候，報錯：Your requirements could not be resolved to an installable set of packages. 和 Installation failed, reverting ./composer.json to its original content.。 注：在此之前，我已經通過

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