Fix MCPServerStreamableHTTP closing user-provided HTTP clients with MCP SDK 1.25+#3854

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pydantic:mainpydantic/pydantic-ai:mainfrom

eekstunt:fix-3745-Fix-MCPServerStreamableHTTP-closing-user-provided-HTTP-clients-with-MCP-SDK-1.25+eekstunt/pydantic-ai:fix-3745-Fix-MCPServerStreamableHTTP-closing-user-provided-HTTP-clients-with-MCP-SDK-1.25+Copy head branch name to clipboard