Add missing google-beta provider to required_providers

[amir-hadi]

You are using the google-beta provider in main.tf, but it's not declared in the required_providers block, which creates a warning on each run.

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[bharathkkb]

Thanks for the PR @amir-hadi
Looks like we are also missing it for mysql module https://github.com/terraform-google-modules/terraform-google-sql-db/blob/master/modules/mysql/versions.tf

[bharathkkb]

Could we also add provider_meta for the beta provider?

terraform-google-sql-db/modules/mssql/versions.tf

Lines 27 to 29 in 704be5d

	provider_meta "google-beta" {
	module_name = "blueprints/terraform/terraform-google-sql-db:mssql/v10.0.0"
	}

[amir-hadi]

@bharathkkb I am not sure what provider_meta does, but I did basically copy & paste it to the right place (I hope!).

[amir-hadi]

@bharathkkb I also added it for mySQL now.

[comment-bot-dev]

@amir-hadi
Thanks for the PR! 🚀
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