I'm getting this too on an upgrade from 2.3.5-p1 to 2.3.7. But there is no other information regarding what the conflicting dependencies are. I need to interim upgrade to 2.3.7 due to a php update at my host. But that's as far as I'll be able to go. Host has chosen not to continue supporting Magento due to resource requirements, so I'll be finding a new store application. yay. Have been using Magento for over 10 years.