Add v5.0 dotnet_framework_version to app_service validation

[favoretti]

Fixes #9241

$ TF_ACC=1 go test -v ./azurerm/internal/services/web/tests -timeout=1000m -run TestAccAzureRMAppService_windowsDotNet5
=== RUN   TestAccAzureRMAppService_windowsDotNet5
=== PAUSE TestAccAzureRMAppService_windowsDotNet5
=== CONT  TestAccAzureRMAppService_windowsDotNet5
--- PASS: TestAccAzureRMAppService_windowsDotNet5 (147.85s)
PASS
ok  	github.com/terraform-providers/terraform-provider-azurerm/azurerm/internal/services/web/tests	149.388s

$ TF_ACC=1 go test -v ./azurerm/internal/services/web/tests -timeout=1000m -run TestAccAzureRMAppService_windowsDotNetUpdate
=== RUN   TestAccAzureRMAppService_windowsDotNetUpdate
=== PAUSE TestAccAzureRMAppService_windowsDotNetUpdate
=== CONT  TestAccAzureRMAppService_windowsDotNetUpdate
--- PASS: TestAccAzureRMAppService_windowsDotNetUpdate (233.25s)
PASS
ok  	github.com/terraform-providers/terraform-provider-azurerm/azurerm/internal/services/web/tests	234.396s

[katbyte]

Thanks @favoretti - LGTM 👍

[ghost]

This has been released in version 2.36.0 of the provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading. As an example:

provider "azurerm" {
    version = "~> 2.36.0"
}
# ... other configuration ...

[ghost]

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