So I had a few problems running phpPgAdmin and found a patch for it: https://github.com/phppgadmin/phppgadmin/files/6102678/phpPgAdmin-7.13.0-php8.patch.gz
The patch was found there: https://github.com/phppgadmin/phppgadmin/pull/118
The problem is, I have no idea how to apply it.
I extracted it from archive using 7z, but still, I don't know what to do with .patch file.
Thanks for the help in advance.