The JIRA Command Line Interface (CLI) is a Marketplace add-on that allows for some extra functionality such as some additional automation and integration, etc. It is an add-on that was created by one of the Marketplace vendors, Bob Swift.
Your renewal likely contains this item because it is an add-on that was purchased and installed for your environment previously.
If you don't renew that add-on and the license expires, the add-on will discontinue functioning which, if the add-on is in use, will cause implementations of the add-on to break.
The CLI page linked above does link to the documentation for the add-on. I suggest you take look at that and see if you can determine if it's being used in your environment.
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