remove tomfitzhenry@ as maintainer for some packages

Motivation: Over the foreseeable future I'll have less time to do
maintenance, so I'm reducing the set of packages I maintain to just
those that I use.

nixos/tests/systemd-networkd-dhcpserver-static-leases.nix

···
 import ./make-test-python.nix ({ lib, ... }: {
   name = "systemd-networkd-dhcpserver-static-leases";
   meta = with lib.maintainers; {
-    maintainers = [ veehaitch tomfitzhenry ];
+    maintainers = [ veehaitch ];
   };
   nodes = {
     router = {

nixos/tests/systemd-networkd-dhcpserver.nix

···
 import ./make-test-python.nix ({pkgs, ...}: {
   name = "systemd-networkd-dhcpserver";
   meta = with pkgs.lib.maintainers; {
-    maintainers = [ tomfitzhenry ];
+    maintainers = [ ];
   };
   nodes = {
     router = { config, pkgs, ... }: {

pkgs/applications/audio/spot/default.nix

···
     description = "Native Spotify client for the GNOME desktop";
     homepage = "https://github.com/xou816/spot";
     license = licenses.mit;
-    maintainers = with maintainers; [ tomfitzhenry ];
+    maintainers = with maintainers; [ ];
     platforms = platforms.linux;
   };
 }

pkgs/applications/misc/numberstation/default.nix

···
     description = "TOTP Authentication application for mobile";
     homepage = "https://sr.ht/~martijnbraam/numberstation/";
     license = licenses.gpl3Only;
-    maintainers = with maintainers; [ dotlambda tomfitzhenry ];
+    maintainers = with maintainers; [ dotlambda ];
   };
 }

pkgs/applications/misc/siglo/default.nix

···
     homepage = "https://github.com/theironrobin/siglo";
     changelog = "https://github.com/theironrobin/siglo/tags/v${version}";
     license = licenses.mpl20;
-    maintainers = with maintainers; [ tomfitzhenry ];
+    maintainers = with maintainers; [ ];
     platforms = platforms.linux;
   };
 }

pkgs/applications/networking/instant-messengers/flare-signal/default.nix

···
     description = "An unofficial Signal GTK client";
     homepage = "https://gitlab.com/Schmiddiii/flare";
     license = lib.licenses.agpl3Plus;
-    maintainers = with lib.maintainers; [ dotlambda tomfitzhenry ];
+    maintainers = with lib.maintainers; [ dotlambda ];
     platforms = lib.platforms.linux;
   };
 }

pkgs/applications/networking/instant-messengers/pidgin/pidgin-plugins/purple-mm-sms/default.nix

···
     description = "A libpurple plugin for sending and receiving SMS via Modemmanager";
     license = licenses.gpl3Plus;
     platforms = platforms.linux;
-    maintainers = with maintainers; [ tomfitzhenry ];
+    maintainers = with maintainers; [ ];
   };
 }

pkgs/development/python-modules/gatt/default.nix

···
     description = "Bluetooth (Generic Attribute Profile) GATT SDK for Python";
     homepage = "https://github.com/getsenic/gatt-python/";
     license = licenses.mit;
-    maintainers = with maintainers; [ tomfitzhenry ];
+    maintainers = with maintainers; [ ];
   };
 }