fix: remove reference to type-fest

closes #1249

package.json

@@ -1,6 +1,6 @@
 {
   "name": "graphql-request",
-  "version": "7.1.1",
+  "version": "7.1.2",
   "packageManager": "[email protected]",
   "type": "module",
   "main": "./build/entrypoints/main.js",

src/lib/prelude.ts

@@ -1,5 +1,3 @@
-import type { ConditionalSimplifyDeep } from 'type-fest/source/conditional-simplify.js'
-
 /* eslint-disable */
 export type RemoveIndex<T> = {
   [K in keyof T as string extends K ? never : number extends K ? never : K]: T[K]
@@ -182,8 +180,6 @@ export type Values<T> = T[keyof T]
 
 export type GetKeyOr<T, Key, Or> = Key extends keyof T ? T[Key] : Or
 
-export type SimplifyDeep<T> = ConditionalSimplifyDeep<T, Function | Iterable<unknown> | Date, object>
-
 export type As<T, U> = U extends T ? U : never
 
 export type UnionToIntersection<U> = (U extends any ? (k: U) => void : never) extends ((k: infer I) => void) ? I : never