Fix typo in powershell executable name (Powershell 7)

[131]

See https://docs.microsoft.com/en-us/powershell/scripting/install/migrating-from-windows-powershell-51-to-powershell-7?view=powershell-7.1

[kapoorlakshya]

@131 Thanks for your contribution!

[G-Rath]

🤦 whoops - good catch!