Update main.yml to use wix version 6.0.0 (#104)

Author: davecramer

.github/workflows/main.yml

@@ -279,7 +279,7 @@ jobs:
       shell: cmd
       run: |
         dotnet tool install --global wix
-        wix extension add --global WixToolset.UI.wixext/5.0.2
+        wix extension add --global WixToolset.UI.wixext/6.0.0
 
     - name: build psqlodbc standard
       shell: powershell