Set required terraform provider versions

It seems like in terraform 1.0 it is recommended to specify the required provider versions otherwise calling the module will result in some annoying warning message like the following.

╷
│ Warning: Provider google is undefined
│
│   on main.tf line 35, in module "project":
│   35:     google      = google.product_admin
│
│ Module module.project does not declare a provider named google.
│ If you wish to specify a provider configuration for the module, add an entry for google in the required_providers
│ block within the module.
╵
╷
│ Warning: Provider google-beta is undefined
│
│   on main.tf line 36, in module "project":
│   36:     google-beta = google-beta.product_admin
│
│ Module module.project does not declare a provider named google-beta.
│ If you wish to specify a provider configuration for the module, add an entry for google-beta in the
│ required_providers block within the module.