Change target framework from net10.0 to net9.0

Author: arika0093

example/BlazorLocalTimeSample/BlazorLocalTimeSample.csproj

@@ -1,6 +1,6 @@
 <Project Sdk="Microsoft.NET.Sdk.BlazorWebAssembly">
   <PropertyGroup>
-    <TargetFramework>net10.0</TargetFramework>
+    <TargetFramework>net9.0</TargetFramework>
     <Nullable>enable</Nullable>
     <ImplicitUsings>enable</ImplicitUsings>
   </PropertyGroup>