data.azurerm_network_interface: add missing property ip_configuration.private_ip_address_version

[katbyte]

before

Test ended in panic.

------- Stdout: -------
=== RUN   TestAccDataSourceArmVirtualNetworkInterface_basic
=== PAUSE TestAccDataSourceArmVirtualNetworkInterface_basic
=== CONT  TestAccDataSourceArmVirtualNetworkInterface_basic

------- Stderr: -------
panic: Invalid address to set: []string{"ip_configuration", "0", "private_ip_address_version"}

after

[17:38:55] kt@snowbook:~/hashi/..3../terraform-providers/terraform-provider-azurerm▸eventhub/fix_acctests$ testazure TestAccDataSourceArmVirtualNetworkInterface_basic
==> Fixing source code with gofmt...
gofmt -s -w ./azurerm
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./azurerm -v -test.run=TestAccDataSourceArmVirtualNetworkInterface_basic -timeout 180m -ldflags="-X=github.com/terraform-providers/terraform-provider-azurerm/version.ProviderVersion=acc"
=== RUN   TestAccDataSourceArmVirtualNetworkInterface_basic
=== PAUSE TestAccDataSourceArmVirtualNetworkInterface_basic
=== CONT  TestAccDataSourceArmVirtualNetworkInterface_basic
--- PASS: TestAccDataSourceArmVirtualNetworkInterface_basic (125.91s)
PASS
ok  	github.com/terraform-providers/terraform-provider-azurerm/azurerm	127.032s

[WodansSon]

@katbyte thanks for the PR, changes LGTM!

[WodansSon]

@katbyte verified test cases, merging after review.

[ghost]

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