haskellPackages.graphql: convert assert on hspec into warning

We should only make use of asserts to assert a property about the
*current* attribute in order to make it possible for downstream users to
change versions of packages: When a downstream user changes the package
an attribute points to, the assert is removed as the attribute is
swapped out, so asserting something about itself is okay. However, when
it asserts a property about another package, changing that other package
may break the package unexpectedly, with no better workaround then
passing in an empty `configurationCommon` overlay.

See also: https://github.com/NixOS/nixpkgs/pull/166425

pkgs/development/haskell-modules/configuration-common.nix

@@ -2240,11 +2240,11 @@ self: super: {
   # Release 1.0.0.0 added version bounds (was unrestricted before),
   # but with too strict lower bounds for our lts-18.
   # Disable aeson for now, future release should support it
-  graphql = assert versionOlder self.hspec.version "2.9.0";
+  graphql =
     assert super.graphql.version == "1.0.2.0";
     appendConfigureFlags [
       "-f-json"
-    ] (doJailbreak super.graphql);
+    ] (lib.warnIf (lib.versionAtLeast self.hspec.version "2.9.0") "@NixOS/haskell: Remove jailbreak for graphql" doJailbreak super.graphql);
 
   # https://github.com/ajscholl/basic-cpuid/pull/1
   basic-cpuid = appendPatch (fetchpatch {