Error : upgrade magento 2.2.6 to magento 2.3.0

To upgrade the website, I used the following blog https://www.webcreta.com/how-to-upgrade-magento-2-2-x-to-2-3-0/

But when I run the composer update command, I got the following error enter image description here

I checked all solutions on https://magento.stackexchange.com/ but I can't found any solution.

Please suggest a solution.

Thank you so much.

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