Add expire_time in secrets level, not resource level

[fulyagonultas]

Currently, it is not possible to add different expire_time in each secret as we have the variable added to the resource not under secrets variable here.

Please add expire_time on secret level, if possible.

https://registry.terraform.io/providers/hashicorp/google/latest/docs/data-sources/secret_manager_secrets

[ludoo]

Thanks for reporting this, would you care to send a PR?