qrupdate: fixup build with cmake 4

I see no attempt to deal with this upstream yet; opening as
https://github.com/mpimd-csc/qrupdate-ng/issues/6

pkgs/by-name/qr/qrupdate/package.nix

@@ -47,6 +47,10 @@ stdenv.mkDerivation (finalAttrs: {
     ./disable-zch1dn-test.patch
   ];
 
+  postPatch = ''
+    sed '/^cmake_minimum_required/Is/VERSION [0-9]\.[0-9]/VERSION 3.5/' -i ./CMakeLists.txt
+  '';
+
   doCheck = true;
 
   nativeBuildInputs = [