Update source path for subnets in metadata.yaml

Author: zubitripathy

modules/compute_instance/metadata.yaml

@@ -102,7 +102,7 @@ spec:
         defaultValue: ""
         connections:
           - source:
-              source: github.com/terraform-google-modules/terraform-google-network//modules/subnets
+              source: github.com/terraform-google-modules/terraform-google-network
               version: ~> 18.0.0
             spec:
               outputExpr: subnets_self_links[0]