fix: Change default cluster for DAG pw_mcjax_benchmark_recipe (GoogleCloudPlatform#1186)

This change updates the cluster for DAG `pw_mcjax_benchmark_recipe`

Author: RUEI4341

dags/maxtext_pathways/configs/parameters.py

@@ -43,7 +43,7 @@
         ),
     ),
     "cluster_name": Param(
-        "pw-v6e-8",
+        "pw-v6e-32x4",
         type="string",
         title="Cluster Name",
         description="GCP cluster name for training model.",
@@ -68,7 +68,7 @@
         enum=DEVICE_VERSION,
     ),
     "core_count": Param(
-        8,
+        32,
         type="integer",
         title="Core Count",
         description='Device core count for the cluster. ex: v6e-"64"',