Added uninstall step first

Author: Microsoft Graph DevX Tooling

azure-pipelines/update-template.yml

@@ -5,6 +5,8 @@ steps:
     targetType: 'inline'
     pwsh: true
     script: |
+          Uninstall-Module Microsoft.Graph -Force -AllVersions -ErrorAction SilentlyContinue
+          Uninstall-Module Microsoft.Graph.Beta -Force -AllVersions -ErrorAction SilentlyContinue
           try{
               # Try to update the V1 module first.
               Install-Module Microsoft.Graph.Beta -Repository PSGallery -Scope AllUsers -AcceptLicense -SkipPublisherCheck -Force -AllowClobber