haskellPackages.dhall-nix: downgrade to 1.1.21 for dhall 1.39

Stackage LTS hasn't upgraded to 1.40 yet -- dhall-nix is not part of
stackage and thus ahead.

pkgs/development/haskell-modules/configuration-hackage2nix/main.yaml

@@ -91,6 +91,8 @@ default-package-overrides:
   - streamly-bytestring < 0.1.3
   - streamly-lmdb < 0.3.0
   - streamly-process
+  # dhall-nix is not part of stackage, remove if dhall >= 1.40
+  - dhall-nix < 1.1.22
 
 extra-packages:
   - base16-bytestring < 1               # required for cabal-install etc.

pkgs/development/haskell-modules/hackage-packages.nix

@@ -74788,6 +74788,30 @@ self: {
      }) {};
 
   "dhall-nix" = callPackage
+    ({ mkDerivation, base, containers, data-fix, dhall, hnix
+     , lens-family-core, neat-interpolation, optparse-generic, text
+     }:
+     mkDerivation {
+       pname = "dhall-nix";
+       version = "1.1.21";
+       sha256 = "0yqqjq8yqswcaiqrrgx37rlwvxgciwhvird34hsaq4fr3kbjgv4h";
+       revision = "1";
+       editedCabalFile = "0pnnlm299sw7jgz6a1bg18nvc2qfgylinc90b3da0cpvaardp6wz";
+       isLibrary = true;
+       isExecutable = true;
+       libraryHaskellDepends = [
+         base containers data-fix dhall hnix lens-family-core
+         neat-interpolation text
+       ];
+       executableHaskellDepends = [
+         base dhall hnix optparse-generic text
+       ];
+       description = "Dhall to Nix compiler";
+       license = lib.licenses.bsd3;
+       maintainers = with lib.maintainers; [ Gabriel439 ];
+     }) {};
+
+  "dhall-nix_1_1_22" = callPackage
     ({ mkDerivation, base, containers, data-fix, dhall, hnix
      , lens-family-core, neat-interpolation, optparse-generic, text
      }:
@@ -74806,6 +74830,7 @@ self: {
        ];
        description = "Dhall to Nix compiler";
        license = lib.licenses.bsd3;
+       hydraPlatforms = lib.platforms.none;
        maintainers = with lib.maintainers; [ Gabriel439 ];
      }) {};