Forgot to update the windows build of the CI to use .NET7 SDK

Author: Warren Buckley

.github/workflows/ci.yml

@@ -40,9 +40,9 @@ jobs:
       - uses: actions/checkout@v2
 
       - name: Setup .NET Core
-        uses: actions/setup-dotnet@v1
+        uses: actions/setup-dotnet@v3
         with:
-          dotnet-version: '6.0.x'
+          dotnet-version: '7.0.x'
 
       - name: Make .NET Core Server excutable
         working-directory: LogViewer.Server