remove jb55 as maintainer from some packages

I no longer use these and don't have much incentive to maintain them :(

pkgs/applications/networking/feedreaders/rss2email/default.nix

···
     description = "A tool that converts RSS/Atom newsfeeds to email";
     homepage = "https://pypi.python.org/pypi/rss2email";
     license = licenses.gpl2;
-    maintainers = with maintainers; [ jb55 Profpatsch ekleog ];
+    maintainers = with maintainers; [ Profpatsch ekleog ];
   };
   passthru.tests = {
     smoke-test = nixosTests.rss2email;

pkgs/applications/networking/instant-messengers/bitlbee-discord/default.nix

···
 
     homepage = "https://github.com/sm00th/bitlbee-discord";
     license = licenses.gpl2Plus;
-    maintainers = with maintainers; [ lassulus jb55 ];
+    maintainers = with maintainers; [ lassulus ];
     platforms = lib.platforms.linux;
   };
 }

pkgs/applications/science/math/caffe/default.nix

···
       Center (BVLC) and by community contributors.
     '';
     homepage = "http://caffe.berkeleyvision.org/";
-    maintainers = with maintainers; [ jb55 ];
+    maintainers = with maintainers; [ ];
     license = licenses.bsd2;
     platforms = platforms.linux ++ platforms.darwin;
   };

pkgs/development/libraries/notcurses/default.nix

···
       replacement for NCURSES on existing systems.
     '';
     license = licenses.asl20;
-    maintainers = with maintainers; [ jb55 AndersonTorres ];
+    maintainers = with maintainers; [ AndersonTorres ];
     inherit (ncurses.meta) platforms;
   };
 }

pkgs/development/libraries/rapidcheck/default.nix

···
   meta = with lib; {
     description = "A C++ framework for property based testing inspired by QuickCheck";
     inherit (src.meta) homepage;
-    maintainers = with maintainers; [ jb55 ];
+    maintainers = with maintainers; [ ];
     license = licenses.bsd2;
     platforms = platforms.all;
   };

pkgs/tools/misc/antimicrox/default.nix

···
   meta = with lib; {
     description = "GUI for mapping keyboard and mouse controls to a gamepad";
     inherit (src.meta) homepage;
-    maintainers = with maintainers; [ jb55 sbruder ];
+    maintainers = with maintainers; [ sbruder ];
     license = licenses.gpl3Plus;
     platforms = with platforms; linux;
   };