freecad: add acuteaangle to maintainers

I use this program and am subscribed to releases and security alerts
upstream; I'd be happy to assist in keeping this up to date and tested :)

(cherry picked from commit d9ec8ea40b)

pkgs/by-name/fr/freecad/package.nix

@@ -200,6 +200,7 @@ freecad-utils.makeCustomizable (
       maintainers = with lib.maintainers; [
         srounce
         grimmauld
+        acuteaangle
       ];
       platforms = lib.platforms.linux;
       mainProgram = "freecad";