Fix schema-api-with-context exports (#9602)

Author: emmatown

.changeset/fix-context.md

@@ -0,0 +1,5 @@
+---
+"@keystone-6/core": patch
+---
+
+Fix incompatible `Context` type export

packages/core/src/types/schema/schema-api-with-context.d.ts

@@ -1,6 +1,5 @@
 import { type GraphQLSchemaAPIWithContext } from '@graphql-ts/schema'
-import { type Context } from './graphql-ts-schema'
 
-declare const __graphql: GraphQLSchemaAPIWithContext<Context>
+declare const __graphql: GraphQLSchemaAPIWithContext<any>
 
 export = __graphql