ci: Update upload-artifact to v4

.github/workflows/dotnet.yml

@@ -33,7 +33,7 @@ jobs:
         cd src/MyApp
         dotnet publish -c Release -f net8.0-browserwasm -p:OverrideTargetFrameworks=net8.0 /bl:/artifacts/mbuild.binlog -o $GITHUB_WORKSPACE/artifacts/wasm
 
-    - uses: actions/upload-artifact@v2
+    - uses: actions/upload-artifact@v4
       with:
         name: drop
-        path: artifacts
+        path: artifacts