I'm using this hack that requires no recompilation for my own setup, the PR was just so others didn't run into the same issue :)

    nixpkgs.overlays = [
      (final: prev: {
        pythonPackagesExtensions = (prev.pythonPackagesExtensions or [ ]) ++ [
          (pfinal: pprev: {
            ical = pprev.ical.override {
              tzdata = pprev.tzdata.overrideAttrs (
                tfinal: tprev: rec {
                  pname = "tzdata";
                  version = "2025.2";

                  src = prev.fetchPypi {
                    inherit pname version;
                    hash = "sha256-tgpjj8wNr/rfgv4PV+U9Br3sLzbE32YoCuebzmvW8rk=";
                  };

                }
              );
            };
          })
        ];
      })
    ];