Update src/a2a/server/routes/__init__.py

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

Author: guglielmo-san

src/a2a/server/routes/__init__.py

@@ -11,7 +11,7 @@
 
 
 __all__ = [
-    'AgentCardRoute',
+    'AgentCardRoutes',
     'CallContextBuilder',
     'DefaultCallContextBuilder',
     'JsonRpcRoute',