Your requirements could not be resolved to an installable set of packages.
Problem 1
laravelista/comments[1.1.0, ..., 1.1.2] require illuminate/support ^5.2 -> found illuminate/support[v5.2.0, ..., 5.8.x-dev] but these were not loaded, likely because it conflicts with another require.
The latest version supports php7.4 and laravel 8. You should upgrade your installation to install the latest version, or you could use an older version of it works for you.
Your requirements could not be resolved to an installable set of packages.
Problem 1
Installation failed, reverting ./composer.json and ./composer.lock to their original content.