gns3Packages.server{Stable,Preview}: Fix the build

I initially thought python3Packages.yarl wouldn't build but then
realized it was actually due to my overwrite.

+1 -1
+1 -1
pkgs/applications/networking/gns3/server.nix
··· 20 20 })); 21 21 yarl = (stdenv.lib.overrideDerivation pythonPackages.yarl 22 22 (oldAttrs: 23 - { propagatedBuildInputs = [ multidict_3_1_3 ]; })); 23 + { propagatedBuildInputs = [ multidict_3_1_3 pythonPackages.idna ]; })); 24 24 aiohttp = (stdenv.lib.overrideDerivation pythonPackages.aiohttp 25 25 (oldAttrs: 26 26 rec {