ci: use latest .net SDK from the 6.0 channel

Author: yv989c

.github/workflows/ci-workflow.yml

@@ -43,7 +43,7 @@ jobs:
       - name: Setup .NET 6
         uses: actions/setup-dotnet@v1
         with:
-          dotnet-version: 6.0.100
+          dotnet-version: 6.0.x
       - name: Restore
         run: dotnet restore BlazarTech.QueryableValues.sln
       - name: Test All