maintainers: create sage team

Maintaining all the packages whose updates might break some aspect of
sage.

For reference:
https://github.com/NixOS/nixpkgs/pull/103810#issuecomment-727536510

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

@@ -67,11 +67,11 @@ buildPythonPackage rec {
     PY_IGNORE_IMPORTMISMATCH=1 pytest
   '';
 
-  meta = {
+  meta = with lib; {
     description = "A Python interface for fplll";
     changelog = "https://github.com/fplll/fpylll/releases/tag/${version}";
     homepage = "https://github.com/fplll/fpylll";
-    maintainers = with lib.maintainers; [ timokau ];
-    license = lib.licenses.gpl2Plus;
+    maintainers = teams.sage.members;
+    license = licenses.gpl2Plus;
   };
 }