chibi: adopt maintainership as applePrincess

pkgs/by-name/ch/chibi/package.nix

···
     description = "Small Footprint Scheme for use as a C Extension Language";
     platforms = lib.platforms.all;
     license = lib.licenses.bsd3;
-    maintainers = [ lib.maintainers.DerGuteMoritz ];
+    maintainers = with lib.maintainers; [
+      applePrincess
+      DerGuteMoritz
+    ];
   };
 }