azurerm_mysql_flexible_server - fix acctest TestAccMySqlFlexibleServer_updateMaintenanceWindow failure

[sinbai]

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Description

Test case TestAccMySqlFlexibleServer_updateMaintenanceWindow failed on Teamcity by the following error：

After the above problem is fixed, the following error occurs when running the test, so updating sku_name to fix it.

ChangeCmwNotSupportedForBurstableSkuServer: Burstable Tier server does not support custom maintenance window anymore. To have more control on the maintenance window, consider upgrade to General Purpose or Business Critical service tier for flexible maintenance. [Learn more](https://go.microsoft.com/fwlink/?linkid=2271375)

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PASS: TestAccMySqlFlexibleServer_updateMaintenanceWindow (1046.26s)

[stephybun]

Why do we need to update the sku_name for the basic config if this property can be updated?

[sinbai]

@stephybun you are right, I have updated the sku_name for the basic config. Thanks!