fix typo in _client_verify_tls

Signed-off-by: Saad Zaher <szaher@redhat.com>

Author: szaher

src/codeflare_sdk/ray/cluster/cluster.py

@@ -89,7 +89,7 @@ def _client_headers(self):
 
     @property
     def _client_verify_tls(self):
-        return _is_openshift_cluster and self.config.verify_tls
+        return _is_openshift_cluster() and self.config.verify_tls
 
     @property
     def job_client(self):