fix: Linux Powershell update (#420)

Co-authored-by: Pim Simons <pim.simons@codit.eu>

Author: pim-simons

build/templates/run-pester-tests.yml

@@ -3,7 +3,9 @@ parameters:
   testName: ''
 
 steps:
-  - pwsh: 'wget -O - https://aka.ms/install-powershell.sh | sudo bash'
+  - pwsh: |
+     Import-Module Microsoft.PowerShell.Management -Force
+     wget -O - https://aka.ms/install-powershell.sh | sudo bash
     displayName: 'Update Powershell on Linux'
     condition: eq( variables['Agent.OS'], 'Linux' )
   - powershell: 'Invoke-Expression -Command "& { $(Invoke-RestMethod -Uri ''https://aka.ms/install-powershell.ps1'') } -UseMSI -quiet" '