Update GitHub Actions workflow to use .NET 10.0.x SDK

Author: jsakamoto

.github/workflows/gh-pages.yml

@@ -20,7 +20,7 @@ jobs:
       - name: Setup .NET
         uses: actions/setup-dotnet@v5
         with:
-          dotnet-version: "9.0.x"
+          dotnet-version: "10.0.x"
       - name: Install .NET WebAssembly Tools
         run: dotnet workload install wasm-tools