Add an explicit requirement on 'hashicorp/external'

[razorsedge]

required_providers does not list external and thus terraform init complains.

...
Initializing provider plugins...
- Checking for available provider plugins...
- Downloading plugin for provider "external" (hashicorp/external) 1.2.0...
- Downloading plugin for provider "aws" (hashicorp/aws) 2.70.0...

The following providers do not have any version constraints in configuration,
so the latest version was installed.

To prevent automatic upgrades to new major versions that may contain breaking
changes, it is recommended to add version = "..." constraints to the
corresponding provider blocks in configuration, with the constraint strings
suggested below.

* provider.external: version = "~> 1.2"

Terraform has been successfully initialized!
...

[antonbabenko]

Thanks for the suggestion.

v1.23.0 has been just released.

[github-actions]

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