Update a product in guest quote

put https://{baseUrl}/V1/storeview/{store-code}/user/guest/quote/{guest-quote-id}/item/{item-id}

Update a product in the guest quote via this endpoint.
Sample Curl
curl --location --request PUT 'https://mygatewayurl.com/V1/storeview/default/user/guest/quote/N3SJm8Jr8ji7DYaknUh6KpfUoW4jpWjP/item/34 --header 'Content-Type: application/json' --data '{"cartItem":{"sku":"product_sku", "qty":1}}'

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