maintainers: remove carpinchomug

No longer has a GitHub account.

Has not committed since initially adding themselves as a maintainer,
which was done as part of adding libctl:

2022-03-17 b792b179ae7e5e75d8396db51a3a2df989b444df
2022-03-17 9cdf795143a2ca42e32f42801e09f5f738660fed

libctl therefore has no listed maintainers.

maintainers/maintainer-list.nix

···
     github = "carlthome";
     githubId = 1595907;
   };
-  carpinchomug = {
-    email = "[e-mail]";
-    github = "carpinchomug";
-    githubId = 101536256;
-    name = "Akiyoshi Suda";
-  };
   cartr = {
     email = "[e-mail]";
     github = "cartr";

pkgs/by-name/li/libctl/package.nix

···
     mainProgram = "gen-ctl-io";
     homepage = "https://github.com/NanoComp/libctl";
     license = licenses.gpl2Only;
-    maintainers = with maintainers; [ carpinchomug ];
+    maintainers = [ ];
   };
 }