data.azurerm_kubernetes_cluster: fix a crash when reading/setting upgrade_settings

[manicminer]

Change Log

Below please provide what should go into the changelog (if anything) conforming to the Changelog Format documented here.

• Data Source: azurerm_kubernetes_cluster - fix a crash when reading/setting upgrade_settings

This is a (please select all that apply):

• Bug Fix
• New Feature (ie adding a service, resource, or data source)
• Enhancement
• Breaking Change

Related Issue(s)

Fixes #26169

Note

If this PR changes meaningfully during the course of review please update the title and description as required.

[katbyte]

LGTM 📟

[raswinraaj]

This seems to have broken the upgrade_settings block in the resource "azurerm_kubernetes_cluster_node_pool". I dont have this block added in my tf code as it is not a mandatory block. Now, Every time , it keeps saying there is a change in my tf plan , but on applying there is no change

[manicminer]

@raswinraaj Thanks for reporting that, could you please file a new issue for that using our Bug Report template, and someone will look into it.

[raswinraaj]

@manicminer PFA the new bug for this #26280

[github-actions]

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