Run an apply. The apply must modify the state. If the apply says there are no changes to apply, temporarily add a resource "null_resource" "some_name" {} to your configuration, just so there is something to change. You can take it out again once the apply has happened.
Upgrade to Terraform 1.x, paying attention to the upgrade guides for the versions you pass.
@maxb Is it possible to schedule google meet ?? I’m confused here, why are you asking me to execute apply command, it will corrupt the previous *state file isn’t it ? I do not wanna to mess the existing infrastructure.
For this upgrade in particular, completing the upgrade will require running terraform apply with Terraform 0.13 after upgrading in order to apply some upgrades to the Terraform state, and we recommend doing that with no other changes pending.
So don’t “mess” with it. Verify the apply will not be changing anything of note before confirming it.