Update cawilliamson maintainer details (chrisaw -> cawilliamson)

maintainers/maintainer-list.nix

···
     githubId = 495429;
     name = "Claas Augner";
   };
+  cawilliamson = {
+    email = "[e-mail]";
+    github = "cawilliamson";
+    githubId = 1141769;
+    matrix = "@cawilliamson:nixos.dev";
+    name = "Christopher A. Williamson";
+  };
   cbley = {
     email = "[e-mail]";
     github = "avdv";
···
     github = "chris-martin";
     githubId = 399718;
     name = "Chris Martin";
-  };
-  chrisaw = {
-    email = "[e-mail]";
-    github = "cawilliamson";
-    githubId = 1141769;
-    name = "Christopher A. Williamson";
   };
   chrisjefferson = {
     email = "[e-mail]";

pkgs/applications/networking/instant-messengers/rambox/pro.nix

···
     description = "Messaging and emailing app that combines common web applications into one";
     homepage = "https://rambox.pro";
     license = licenses.unfree;
-    maintainers = with maintainers; [ chrisaw ];
+    maintainers = with maintainers; [ cawilliamson ];
     platforms = [ "x86_64-linux" ];
   };
 }

pkgs/applications/video/mkclean/default.nix

···
     description = "Command line tool to clean and optimize Matroska (.mkv / .mka / .mks / .mk3d) and WebM (.webm / .weba) files that have already been muxed";
     homepage = "https://www.matroska.org";
     license = licenses.bsdOriginal;
-    maintainers = with maintainers; [ chrisaw ];
+    maintainers = with maintainers; [ cawilliamson ];
     platforms = [ "i686-linux" "x86_64-linux" ];
   };
 }