elm: disable dependencies' tests to fix build

these haskell packages need their tests disabled after recent hackage
package version bumps.

partial fix for #38023

pkgs/development/haskell-modules/configuration-ghc-8.0.x.nix

@@ -66,6 +66,13 @@ self: super: {
   inline-c = super.inline-c_0_5_6_1;
   inline-c-cpp = super.inline-c-cpp_0_1_0_0;
 
+  # test dep hedgehog pulls in concurrent-output, which does not build
+  # due to processing version mismatch
+  either = dontCheck super.either;
+
+  # test dep tasty has a version mismatch
+  indents = dontCheck super.indents;
+
   # Newer versions require GHC 8.2.
   haddock-api = self.haddock-api_2_17_4;
   haddock = self.haddock_2_17_5;