Update network module versions in metadata.yaml

Author: zubitripathy

modules/compute_instance/metadata.yaml

@@ -93,23 +93,29 @@ spec:
         connections:
           - source:
               source: github.com/terraform-google-modules/terraform-google-network
-              version: "~> 6.0"
+              version: "~> 18.0.0"
             spec:
-              outputExpr: network_self_link
+              outputExpr: network_name
       - name: subnetwork
         description: Subnet to deploy to. Only one of network or subnetwork should be specified.
         varType: string
         defaultValue: ""
         connections:
           - source:
               source: github.com/terraform-google-modules/terraform-google-network//modules/subnets
-              version: ~> 6.0
+              version: ~> 18.0.0
             spec:
-              outputExpr: subnets[0].self_link
+              outputExpr: subnets_self_links[0]
       - name: subnetwork_project
         description: The project that subnetwork belongs to
         varType: string
         defaultValue: ""
+        connections:
+          - source:
+              source: github.com/terraform-google-modules/terraform-google-network
+              version: "~> 18.0.0"
+            spec:
+              outputExpr: project_id
       - name: hostname
         description: Hostname of instances
         varType: string