红帽全球峰会6.3.12.2. hub downgrade
对一个安装的资源进行降级。
示例：将 mynamespace 命名空间中的 mytask 任务降级到它的较旧版本
tkn hub downgrade task mytask --to version -n mynamespace
$ tkn hub downgrade task mytask --to version -n mynamespace
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