Add Require Powershell 7 directive to UpdateTemplate.ps1 #8133
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UpdateTemplate.ps1 contains null coalescing operator that was introduced in powershell 7. More here https://docs.microsoft.com/en-us/powershell/scripting/whats-new/What-s-New-in-PowerShell-70?view=powershell-7.2
closes #8130