maintainers: drop hikari

The GitHub account doesn't exist anymore. Note: There is a *new* GitHub
account with the same name, but the ID is different.

Commit c48aae965e046dc41d11fc58234ce48dece3b385 introduced this
maintainer in 2023, but the new account was only created in 2024.

Changed files
-6
maintainers
-6
maintainers/maintainer-list.nix
···
github = "higebu";
githubId = 733288;
-
hikari = {
-
email = "HikariNee@protonmail.com";
-
github = "HikariNee";
-
githubId = 72349937;
-
name = "Hikari";
-
};
hirenashah = {
email = "hiren@hiren.io";
github = "hirenashah";