Increase memory for ray head pod

Author: Shilpa Chugh

tests/e2e/mnist_raycluster_sdk_oauth_test.py

@@ -43,7 +43,7 @@ def run_mnist_raycluster_sdk_oauth(self):
                 namespace=self.namespace,
                 num_workers=1,
                 head_cpus="500m",
-                head_memory=2,
+                head_memory=4,
                 worker_cpu_requests=1,
                 worker_cpu_limits=1,
                 worker_memory_requests=1,