Fix the incorrect usage of serpapi

serpapi does not have `GoogleSearch` module. See https://pypi.org/project/serpapi/

tools/text_web_browser.py

@@ -4,8 +4,10 @@ import mimetypes
 import os
 import pathlib
 import re
+import serpapi
 import time
 import uuid
+
 from datetime import datetime
 from typing import Any
 from urllib.parse import unquote, urljoin, urlparse
@@ -13,7 +15,6 @@ from urllib.parse import unquote, urljoin, urlparse
 import pathvalidate
 import requests
 from duckduckgo_search import DDGS
-from serpapi import GoogleSearch
 
 from smolagents import Tool
 
@@ -41,6 +42,7 @@ class SimpleTextBrowser:
         self.viewport_pages: list[tuple[int, int]] = list()
         self.set_address(self.start_page)
         self.serpapi_key = serpapi_key
+        self.serpapi_client = serpapi.Client(api_key=serpapi_key) if serpapi_key else None
         self.request_kwargs = request_kwargs
         self.request_kwargs["cookies"] = COOKIES
         self._mdconvert = MarkdownConverter()
@@ -214,12 +216,11 @@ class SimpleTextBrowser:
         params = {
             "engine": "google",
             "q": query,
-            "api_key": self.serpapi_key,
         }
         if filter_year is not None:
             params["tbs"] = f"cdr:1,cd_min:01/01/{filter_year},cd_max:12/31/{filter_year}"
 
-        search = GoogleSearch(params)
+        search = self.serpapi_client.search(params)
         results = search.get_dict()
         self.page_title = f"{query} - Search"
         if "organic_results" not in results.keys():