teams/flyingcircus: remove ma27 from members

By the end of the month, I'll leave Flying Circus. Thanks a lot for the
journey together <3

The rootless-test for podman is something I decided to keep since I'm
using parts of the features covered in there myself.

maintainers/team-list.nix

···
       frlan
       leona
       osnyx
-      ma27
     ];
     scope = "Team for Flying Circus employees who collectively maintain packages.";
     shortName = "Flying Circus employees";

nixos/tests/oci-containers.nix

···
     type:
     makeTest {
       name = "oci-containers-podman-rootless-${type}";
-      meta.maintainers = lib.teams.flyingcircus.members;
+      meta.maintainers = lib.teams.flyingcircus.members ++ [ lib.maintainers.ma27 ];
       nodes = {
         podman =
           { pkgs, ... }: