Fix Apigee PAYG Node Config Dynamic Block

Fixed attribute reference issues for the
`node_config` dynamic block.

Changes committed:
- modified:   `modules/apigee/main.tf`

modules/apigee/main.tf

@@ -47,8 +47,8 @@ resource "google_apigee_environment" "environments" {
   dynamic "node_config" {
     for_each = try(each.value.node_config, null) != null ? [""] : []
     content {
-      min_node_count = node_config.min_node_count
-      max_node_count = node_config.max_node_count
+      min_node_count = each.value.node_config.min_node_count
+      max_node_count = each.value.node_config.max_node_count
     }
   }
   org_id = local.org_id