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What do you mean by how do you update CarPlay? It’s part of iOS so any changes ares included with your iPhones standard update process.
 
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If you speak of updates to your vehicle, that would come via vehicle / head unit manufacturer. CarPlay is essentially an additional screen functionality for your iPhone.
 
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To be fair, the OEM head unit must also be updated if there is integration with the CarPlay systems (just to work properly or have all functions available on the car side like fuel data, integration with multiple screens, etc.). But generally speaking, yes, it is updated through your iOS device on your phone.
 
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