Use --no-incremental on build step as required by SonarScanner docs

Co-authored-by: 304NotModified <5808377+304NotModified@users.noreply.github.com>

Author: Copilot

.github/workflows/sonarcloud.yml

@@ -43,7 +43,7 @@ jobs:
             /d:sonar.cs.vscoveragexml.reportsPaths="coverage.xml"
 
       - name: Build
-        run: dotnet build SLNX-validator.slnx --no-restore -c Release
+        run: dotnet build SLNX-validator.slnx --no-incremental -c Release
 
       - name: Test with coverage
         run: dotnet-coverage collect "dotnet test --solution SLNX-validator.slnx --no-build -c Release --verbosity normal" -f xml -o coverage.xml