Upgrade from 4.2.10 to 4.2.12

Did you copy vendor/codeigniter4/framework/composer.json to composer.json in your project root ?
vendor/codeigniter4/framework/composer.json is composer.json for the framework, not your app.
Please don't do.

If you update your project composer.json, check the latest composer.json in https://github.com/codeigniter4/appstarter
Basically your composer.json is yours. You need to update when you really need.

I recommend you learn how to use Composer. Because it is industrial standard package system.

OK, I found the reason I didn't see in composer.json an http was changed to https in the "support" root, I thought other changes had been made as in the other files listed and by my mistake I didn't compare the files because they seemed the same to me, everything else is clear, sorry for the confusion