chore(users/Profpatsch/cas-serve): remove dependency on superrecord

The use of superrecord here can be replaced by simple labelled tuples.

Change-Id: I23690cd0b88896440521fe81e83347ef4773d4a0
Reviewed-on: https://cl.tvl.fyi/c/depot/+/7713
Reviewed-by: sterni <sternenseemann@systemli.org>
Autosubmit: Profpatsch <mail@profpatsch.de>
Reviewed-by: Profpatsch <mail@profpatsch.de>
Tested-by: BuildkiteCI

users/Profpatsch/cas-serve/default.nix

@@ -7,7 +7,6 @@ let
         pkgs.haskellPackages.wai
         pkgs.haskellPackages.warp
         pkgs.haskellPackages.sqlite-simple
-        pkgs.haskellPackages.superrecord
         depot.users.Profpatsch.my-prelude
       ];
       ghcArgs = [ "-threaded" ];