maintainers: drop galaxy

GitHub account doesn't exist anymore.

maintainers/maintainer-list.nix

···
     githubId = 45048741;
     name = "Alwanga Oyango";
   };
-  galaxy = {
-    email = "[e-mail]";
-    matrix = "@galaxy:mozilla.org";
-    name = "The Galaxy";
-    github = "ga1aksy";
-    githubId = 148551648;
-    keys = [ { fingerprint = "48CA 3873 9E9F CA8E 76A0  835A E3DE CF85 4212 E1EA"; } ];
-  };
   gale-username = {
     name = "gale";
     email = "[e-mail]";

pkgs/by-name/gu/guile-sjson/package.nix

···
     description = "S-expression based json reader/writer for Guile";
     homepage = "https://gitlab.com/dustyweb/guile-sjson";
     license = licenses.lgpl3Plus;
-    maintainers = with maintainers; [ galaxy ];
     platforms = guile.meta.platforms;
   };
 })

pkgs/by-name/ko/konbucase/package.nix

···
     homepage = "https://github.com/ryonakano/konbucase";
     description = "Case converting app suitable for coding or typing";
     license = lib.licenses.gpl3Only;
-    maintainers = with lib.maintainers; [ galaxy ];
     platforms = lib.platforms.linux;
     mainProgram = "konbucase";
   };

pkgs/by-name/lu/lux/package.nix

···
     homepage = "https://github.com/iawia002/lux";
     changelog = "https://github.com/iawia002/lux/releases/tag/v${version}";
     license = lib.licenses.mit;
-    maintainers = with lib.maintainers; [ galaxy ];
     mainProgram = "lux";
   };
 }

pkgs/by-name/te/textsnatcher/package.nix

···
     homepage = "https://textsnatcher.rf.gd/";
     changelog = "https://github.com/RajSolai/TextSnatcher/releases/tag/v${finalAttrs.version}";
     license = licenses.gpl3Only;
-    maintainers = with maintainers; [ galaxy ];
     mainProgram = "com.github.rajsolai.textsnatcher";
     platforms = platforms.linux;
   };