gucharmap: 15.0.0 → 15.0.1
gucharmap: 15.0.0 → 15.0.1

https://gitlab.gnome.org/GNOME/gucharmap/-/compare/15.0.0...15.0.1

Also switch to `gitUpdater` since `nix-update` depends on `NIX_PATH`
and chooses an incorrect version when a maintanance release
for an older branch is tagged after the latest release.

Changelog-Reviewed-By: Jan Tojnar <d9f1726d8be03a58a342b4427bc33a0ff93aec30@gmail.com>

NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs