typo fix

Signed-off-by: Maia Iyer <maia.raj.iyer@gmail.com>

Author: maia-iyer

a2a/slack_researcher/a2a_agent.py

@@ -220,7 +220,7 @@ def run():
     app = server.build()  # this returns a Starlette app
     # if one of the auth variables is set, create middleware
     # if none of them are set, ignore all authorization headers. No token validation will be performed
-    if not settings.JWKS_URL is None:
+    if not settings.JWKS_URI is None:
         logging.info("JWKS_URI is set - using JWT Validation middleware")
         app.add_middleware(AuthenticationMiddleware, backend=BearerAuthBackend(), on_error=on_auth_error)