Problems : Your requirements could not be resolved to an installable set of packages.
Solution :
Run this command:
composer install --ignore-platform-reqs
or
composer update --ignore-platform-reqs
Solution 2nd
I solved the same issue setting 'laravel/framework' dependency version from "^8.0" to "^7.0".
After that running
"composer update --ignore-platform-reqs" simply worked