add setup dotnet to build-win.yml (#155)

Author: phnx47-bot

.github/workflows/build-win.yml

@@ -17,5 +17,12 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v4
 
+      - name: Setup .NET
+        uses: actions/setup-dotnet@v4
+        with:
+          dotnet-version: |
+            6.0.x
+            8.0.x
+
       - name: Run tests
         run: dotnet test -c Release -p:CollectCoverage=false