revert anyurl change

Author: asheshvidyut

src/mcp/server/session.py

@@ -42,7 +42,7 @@ async def handle_list_prompts(ctx: RequestContext) -> list[types.Prompt]:
 import anyio
 import anyio.lowlevel
 from anyio.streams.memory import MemoryObjectReceiveStream, MemoryObjectSendStream
-from pydantic import TypeAdapter
+from pydantic import AnyUrl, TypeAdapter
 
 import mcp.types as types
 from mcp.server.experimental.session_features import ExperimentalServerSessionFeatures
@@ -232,7 +232,7 @@ async def send_log_message(
             related_request_id,
         )
 
-    async def send_resource_updated(self, uri: str) -> None:  # pragma: no cover
+    async def send_resource_updated(self, uri: str | AnyUrl) -> None:  # pragma: no cover
         """Send a resource updated notification."""
         await self.send_notification(
             types.ResourceUpdatedNotification(