Remove JSON support in the core package

graphql.cabal

@@ -21,18 +21,12 @@ extra-source-files:
   CHANGELOG.md
   README.md
 tested-with:
-  GHC == 8.10.7,
   GHC == 9.2.4
 
 source-repository head
   type: git
   location: git://caraus.tech/pub/graphql.git
 
-flag Json
-  description: Whether to build against @aeson 1.x@
-  default: False
-  manual: True
-
 library
   exposed-modules:
     Language.GraphQL
@@ -53,7 +47,6 @@ library
     Language.GraphQL.Type.Schema
     Language.GraphQL.Validate
     Language.GraphQL.Validate.Validation
-    Test.Hspec.GraphQL
   other-modules:
     Language.GraphQL.Execute.Transform
     Language.GraphQL.Type.Definition
@@ -72,15 +65,9 @@ library
     parser-combinators >= 1.3 && < 2,
     template-haskell >= 2.16 && < 3,
     text >= 1.2 && < 3,
-    transformers ^>= 0.5.6,
+    transformers >= 0.5.6 && < 0.7,
     unordered-containers ^>= 0.2.14,
-    vector ^>= 0.12.3
-  if flag(Json)
-    build-depends:
-      aeson >= 1.5.6 && < 1.6,
-      hspec-expectations >= 0.8.2 && < 0.9,
-      scientific >= 0.3.7 && < 0.4
-    cpp-options: -DWITH_JSON
+    vector >= 0.12 && < 0.14
 
   default-language: Haskell2010