maintainers: remove interdependence (#422755)

maintainers/maintainer-list.nix

···
     githubId = 54999;
     name = "Ariel Nunez";
   };
-  interdependence = {
-    email = "[e-mail]";
-    github = "interdependence";
-    githubId = 45567423;
-    name = "William Vandervalk";
-  };
   Intuinewin = {
     email = "[e-mail]";
     github = "Intuinewin";

pkgs/by-name/ba/backrest/package.nix

···
     homepage = "https://github.com/garethgeorge/backrest";
     changelog = "https://github.com/garethgeorge/backrest/releases/tag/v${version}";
     license = lib.licenses.gpl3Only;
-    maintainers = with lib.maintainers; [ interdependence ];
+    maintainers = with lib.maintainers; [ ];
     mainProgram = "backrest";
     platforms = lib.platforms.unix;
   };