Windows shell on x86_64-linux fails

[perturbing]

Hi, I want to debug some CI issue for a Windows build using

nix develop github:input-output-hk/devx#ghc810-windows-iog

but I get the error

evaluation warning: Explicitly set the ABI version of 'webkitgtk'
error: hash mismatch in fixed-output derivation '/nix/store/6ahvilvamsqn20m1hxlqpfsj8n5an3k2-head.hackage.ghc.haskell.org.drv':
         specified: sha256-aVI93DtHziicNn2mGli0YE+bC5BeT7mOQQETp2Thi68=
            got:    sha256-q4wfxy7yq0HvemfA01XyqkSbSAAxrzdYnaxTrF/5Wyw=
error: 1 dependencies of derivation '/nix/store/x1v46hfs8kmkqpnxrka20dmb5gwvihlb-dot-cabal.drv' failed to build
error:
       … while calling the 'derivationStrict' builtin
         at <nix/derivation-internal.nix>:34:12:
           33|
           34|   strict = derivationStrict drvAttrs;
             |            ^
           35|

       … while evaluating derivation 'nix-shell'
         whose name attribute is located at /nix/store/y8pbnccb8bc1p8fchx7zkb0874yblrg3-source/pkgs/stdenv/generic/make-derivation.nix:336:7

       … while evaluating attribute 'nativeBuildInputs' of derivation 'nix-shell'
         at /nix/store/y8pbnccb8bc1p8fchx7zkb0874yblrg3-source/pkgs/stdenv/generic/make-derivation.nix:380:7:
          379|       depsBuildBuild              = elemAt (elemAt dependencies 0) 0;
          380|       nativeBuildInputs           = elemAt (elemAt dependencies 0) 1;
             |       ^
          381|       depsBuildTarget             = elemAt (elemAt dependencies 0) 2;

       (stack trace truncated; use '--show-trace' to show the full, detailed trace)

       error: 1 dependencies of derivation '/nix/store/zgh395lq4wwdcx5bm5p046ccii8v6ggk-happy-plan-to-nix-pkgs.drv' failed to build

note that this is against main (56f63fcaab17a7a408680bf764b29a0d739e3774).

[angerman]

We shouldn't depend on head.hackage anywhere... this is ... concerning. head.hackage is in no way something we should even remotely use.