Update GitVersion task in Pipeline

[PlagueHO]

Update azure-pipelines.yml to replace GitVersion task with:

          - pwsh: |
              dotnet tool install --global GitVersion.Tool
              $gitVersionObject = dotnet-gitversion | ConvertFrom-Json
              $gitVersionObject.PSObject.Properties.ForEach{
                  Write-Host -Object "Setting Task Variable '$($_.Name)' with value '$($_.Value)'."
                  Write-Host -Object "##vso[task.setvariable variable=$($_.Name);]$($_.Value)"
              }
              Write-Host -Object "##vso[build.updatebuildnumber]$($gitVersionObject.FullSemVer)"
            displayName: Calculate ModuleVersion (GitVersion)