[browser] bump benchmarks to Net9 (#97305)

Co-authored-by: Radek Doulik <radek.doulik@gmail.com>

Author: pavelsavara

src/mono/sample/wasm/blazor-frame/blazor.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk.BlazorWebAssembly">
 
   <PropertyGroup>
-    <TargetFramework>net8.0</TargetFramework>
+    <TargetFramework>net9.0</TargetFramework>
     <Nullable>enable</Nullable>
     <ImplicitUsings>enable</ImplicitUsings>
     <StaticWebAssetBasePath>blazor-template/</StaticWebAssetBasePath>
@@ -10,8 +10,9 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.AspNetCore.Components.WebAssembly" Version="8.0.0" />
-    <PackageReference Include="Microsoft.AspNetCore.Components.WebAssembly.DevServer" Version="8.0.0" PrivateAssets="all" />
+    <!-- TODO un-pin this when it's possible -->
+    <PackageReference Include="Microsoft.AspNetCore.Components.WebAssembly" Version="9.0.0-alpha.1.24061.8" />
+    <PackageReference Include="Microsoft.AspNetCore.Components.WebAssembly.DevServer" Version="9.0.0-alpha.1.24061.8" PrivateAssets="all" />
   </ItemGroup>
 
 </Project>

src/mono/sample/wasm/browser-frame/browser-frame.csproj

@@ -1,6 +1,6 @@
 <Project Sdk="Microsoft.NET.Sdk.WebAssembly">
   <PropertyGroup>
-    <TargetFramework>net8.0</TargetFramework>
+    <TargetFramework>net9.0</TargetFramework>
     <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
     <EmitCompilerGeneratedFiles>true</EmitCompilerGeneratedFiles>
   </PropertyGroup>