Adjust SDK version installed in CI

azure-pipelines.yml

@@ -36,9 +36,9 @@ steps:
   displayName: Set Version
 
 - task: UseDotNet@2
-  displayName: 'Install .NET Core SDK'
+  displayName: 'Install .NET SDK'
   inputs:
-    version: 5.0.403
+    version: 6.0.400
     performMultiLevelLookup: true
 
 # Workaround for VS2022 in CI Builds