2i2c, terraform: update core node from n1- to n2-highmem-4

terraform/gcp/projects/pilot-hubs.tfvars

@@ -1,15 +1,19 @@
 prefix     = "pilot-hubs"
 project_id = "two-eye-two-see"
 
-zone   = "us-central1-b"
-region = "us-central1"
-
-core_node_machine_type = "n1-highmem-4"
+zone             = "us-central1-b"
+region           = "us-central1"
+regional_cluster = false
 
-# Multi-tenant cluster, network policy is required to enforce separation between hubs
-enable_network_policy = true
+k8s_versions = {
+  min_master_version : "1.26.5-gke.2100",
+  core_nodes_version : "1.26.5-gke.2100",
+  notebook_nodes_version : "1.26.4-gke.1400",
+  dask_nodes_version : "1.26.5-gke.1400",
+}
 
-regional_cluster = false
+core_node_machine_type = "n2-highmem-4"
+enable_network_policy  = true
 
 enable_filestore      = true
 filestore_capacity_gb = 5120