Fix net_ipv4_ip_local_port_range_max range for azurerm_kubernetes_cluster default node pool

[heoelri]

Adjusting ValidateFunc for net_ipv4_ip_local_port_range_max from IntBetween(1024, 60999) to IntBetween(32768, 65000) based on the documentation here: https://docs.microsoft.com/en-us/azure/aks/custom-node-configuration#socket-and-network-tuning

This was raised in issue #12483 by @Ledermayer

+adding sensitive = true in the kubernetes docs example. To avoid an error when using the example definition:

[katbyte]

Thanks @heoelri - LGTM ❄️

[github-actions]

This functionality has been released in v2.71.0 of the Terraform Provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading.

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[github-actions]

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