Update
Add 2 akamai_property_activation resources to your property.tf. One for the staging network and the other one for the production network.
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Hint: You can use the local.notes defined in the Exercises section in module 7. Terraform Locals
Configure
Add a depends_on to the production activation resource so that the production activation doesn't start until the staging activation has completed.
Plan/Apply
Run terraform plan to confirm your changes. Run terraform apply if all looks in order.
Commit
Commit your change and push it to GitHub.
Although this is not a real use case it shows how the order of the resources updates/creations can be somewhat controlled.