upgrade load balancer API to 2020-05-01

[magodo]

Fix #7691 (although it is closed, as we downgraded the api version to 03-01)

Test

💤 make testacc TEST=./azurerm/internal/services/loadbalancer TESTARGS='-run TestAccAzureRMLoadBalancerRule_vmssBackendPoolUpdateRemoveLBRule'
==> Checking that code complies with gofmt requirements...
==> Checking that Custom Timeouts are used...
==> Checking that acceptance test packages are used...
TF_ACC=1 go test ./azurerm/internal/services/loadbalancer -v -run TestAccAzureRMLoadBalancerRule_vmssBackendPoolUpdateRemoveLBRule -timeout 180m -ldflags="-X=github.com/terraform-providers/terraform-provider-azurerm/version.ProviderVersion=acc"
=== RUN   TestAccAzureRMLoadBalancerRule_vmssBackendPoolUpdateRemoveLBRule
=== PAUSE TestAccAzureRMLoadBalancerRule_vmssBackendPoolUpdateRemoveLBRule
=== CONT  TestAccAzureRMLoadBalancerRule_vmssBackendPoolUpdateRemoveLBRule
--- PASS: TestAccAzureRMLoadBalancerRule_vmssBackendPoolUpdateRemoveLBRule (602.06s)
PASS
ok      github.com/terraform-providers/terraform-provider-azurerm/azurerm/internal/services/loadbalancer        602.100s

[tombuildsstuff]

one comment but this otherwise LGTM 👍

[magodo]

@tombuildsstuff Done.

[tombuildsstuff]

LGTM 👍

[tombuildsstuff]

Tests pass:

[ghost]

This has been released in version 2.45.0 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 = "~> 2.45.0"
}
# ... other configuration ...

[ghost]

I'm going to lock this issue because it has been closed for 30 days ⏳. This helps our maintainers find and focus on the active issues.

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