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 b792b179ae
2022-03-17 9cdf795143

libctl therefore has no listed maintainers.

maintainers/maintainer-list.nix

@@ -4186,12 +4186,6 @@
     github = "carlthome";
     githubId = 1595907;
   };
-  carpinchomug = {
-    email = "aki.suda@protonmail.com";
-    github = "carpinchomug";
-    githubId = 101536256;
-    name = "Akiyoshi Suda";
-  };
   cartr = {
     email = "carter.sande@duodecima.technology";
     github = "cartr";

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

@@ -33,6 +33,6 @@ stdenv.mkDerivation rec {
     mainProgram = "gen-ctl-io";
     homepage = "https://github.com/NanoComp/libctl";
     license = licenses.gpl2Only;
-    maintainers = with maintainers; [ carpinchomug ];
+    maintainers = [ ];
   };
 }