feat: Upgrade AzureRM Providers to Version 4

[jquinn99002]

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Description

Is your feature request related to an issue? No

AzureRM Version 4 has now been releaed, when are you planning to upgrade all AzureRM providers to V4?

Describe the solution you'd like

All AzureRM Providers in terraform-azurerm-lz-vending should be constrained to major version 4

Additional context

[aquarhead]

I'm very curious to see how creating a subscription would work with v4 provider, since subscription_id is now a required configuration hashicorp/terraform-provider-azurerm#26621

[matt-FFFFFF]

Yes that's an interesting point!

We will consider moving to AzAPI only for the next major version.