Update DotNET-build.yml

Author: followynne

.github/workflows/DotNET-build.yml

@@ -39,7 +39,11 @@ jobs:
       - name: Setup dotnet 7
         uses: actions/setup-dotnet@v4
         with:
-          dotnet-version: '7.0.x'
+          dotnet-version: '7.0.x'
+      - name: Setup dotnet 8
+        uses: actions/setup-dotnet@v4
+        with:
+          dotnet-version: '8.0.x'
       - uses: actions/setup-java@v4
         with:
           distribution: 'temurin'