Fix: Forward max_uses parameter to Anthropic WebSearchTool (#2561)

Author: eballesteros

pydantic_ai_slim/pydantic_ai/models/anthropic.py

@@ -359,6 +359,7 @@ def _get_builtin_tools(
                     BetaWebSearchTool20250305Param(
                         name='web_search',
                         type='web_search_20250305',
+                        max_uses=tool.max_uses,
                         allowed_domains=tool.allowed_domains,
                         blocked_domains=tool.blocked_domains,
                         user_location=user_location,