Update GitHub Actions to use upload-artifact@v4

Author: nicola02nb

.github/workflows/build-windows.yml

@@ -27,7 +27,7 @@ jobs:
           cd build
           make test
       - name: Upload artifact
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: headsetcontrol.exe
           path: build/headsetcontrol.exe