chore(schema): update types.py

Signed-off-by: Shingo OKAWA <[email protected]>

Author: ognis1205

src/a2a/types.py

@@ -1,5 +1,5 @@
 # generated by datamodel-codegen:
-#   filename:  https://raw.githubusercontent.com/google-a2a/A2A/refs/heads/main/specification/json/a2a.json
+#   filename:  https://raw.githubusercontent.com/ognis1205/A2A/refs/heads/poc/agent-catalog/specification/json/a2a.json
 
 from __future__ import annotations
 
@@ -549,7 +549,7 @@ class Linkset(BaseModel):
     """
 
 
-class Role(Enum):
+class Role(str, Enum):
     """
     Message sender's role
     """
@@ -1156,7 +1156,7 @@ class AgentCatalog(BaseModel):
     linkset: list[AgentLinkContext]
     """
     An array of AgentLinkContext objects.
-    Each object uses the `anchor` to specify the agent’s endpoint and the `describedby` link to
+    Each object uses the `anchor` to specify the agent's endpoint and the `describedby` link to
     indicate the endpoint of its agent card.
     """