Drop removed hrana-client re-exports from client test

hrana-client 0.10.0 removed the Request, Response, and fetch re-exports
in favor of the Node 18+ globals. The client test now relies on those
globals directly (typed via @types/node), so the imports must go.

Author: penberg

packages/libsql-client/src/__tests__/client.test.ts

@@ -2,9 +2,6 @@ import console from "node:console";
 import { expect } from "@jest/globals";
 import type { MatcherFunction } from "expect";
 
-import type { Request, Response } from "@libsql/hrana-client";
-import { fetch } from "@libsql/hrana-client";
-
 import "./helpers.js";
 
 import type * as libsql from "../node.js";