Upgrade to .NET 9, update packages

Author: codemonkey85

.editorconfig

@@ -125,6 +125,7 @@ csharp_style_allow_blank_line_after_token_in_arrow_expression_clause_experimenta
 csharp_style_allow_blank_line_after_token_in_conditional_expression_experimental = true:silent
 csharp_style_prefer_primary_constructors = true:suggestion
 csharp_style_prefer_readonly_struct_member = true:suggestion
+csharp_prefer_system_threading_lock = true:suggestion
 
 [*.{cs,vb}]
 #### Naming styles ####

TicTacToeBlazor/TicTacToeBlazor.csproj

@@ -1,16 +1,17 @@
 <Project Sdk="Microsoft.NET.Sdk.BlazorWebAssembly">
 
 	<PropertyGroup>
-		<TargetFramework>net8.0</TargetFramework>
+		<TargetFramework>net9.0</TargetFramework>
 		<Nullable>enable</Nullable>
 		<ImplicitUsings>enable</ImplicitUsings>
 		<ServiceWorkerAssetsManifest>service-worker-assets.js</ServiceWorkerAssetsManifest>
 	</PropertyGroup>
 
 	<ItemGroup>
-		<PackageReference Include="Microsoft.AspNetCore.Components.WebAssembly" Version="8.0.7" />
-		<PackageReference Include="Microsoft.AspNetCore.Components.WebAssembly.DevServer" Version="8.0.7" PrivateAssets="all" />
-		<PackageReference Include="MudBlazor" Version="7.3.0" />
+		<PackageReference Include="Microsoft.AspNetCore.Components.WebAssembly" Version="9.0.0" />
+		<PackageReference Include="Microsoft.AspNetCore.Components.WebAssembly.DevServer" Version="9.0.0" PrivateAssets="all" />
+		<PackageReference Include="MudBlazor" Version="7.15.0" />
+		<PackageReference Include="System.Text.Json" Version="9.0.0" />
 	</ItemGroup>
 
 	<ItemGroup>

global.json

@@ -2,6 +2,6 @@
   "sdk": {
     "allowPrerelease": false,
     "rollForward": "latestMinor",
-    "version": "8.0.303"
+    "version": "9.0.100"
   }
 }