Prefer ::new() instead of New-Object

[m-kostrzewa]

Like here: https://github.com/Juniper/contrail-windows-ci/pull/332/files#diff-2b94993ba21665904f14bb70fce67521L84

::new() is faster. See the bottom of this article: https://learn-powershell.net/2014/09/07/more-new-stuff-in-powershell-v5-a-new-way-to-construct-things/