Update quickstart tutorials to use NSB 9

Author: awright18

tutorials/nservicebus-step-by-step/1-getting-started/tutorial.md

@@ -23,14 +23,14 @@ Let's build something simple to give NServiceBus a try.
 This tutorial uses NServiceBus version 8, .NET 6, and assumes an up-to-date installation of [Visual Studio 2022](https://www.visualstudio.com/downloads/).
 
 > [!NOTE]
-> NServiceBus 8 also [supports .NET Framework 4.7.2 or higher](/nservicebus/operations/dotnet-framework-version-requirements.md), but [new applications should be built on .NET 6 or higher](https://devblogs.microsoft.com/dotnet/net-core-is-the-future-of-net/).
+> NServiceBus 8 also [supports .NET Framework 4.7.2 or higher](/nservicebus/operations/dotnet-framework-version-requirements.md), but new applications should use NServiceBus 9 and [.NET 8 or higher](https://devblogs.microsoft.com/dotnet/net-core-is-the-future-of-net/).
 
 ### Create a solution
 
 First, let's create a basic solution and include the dependencies we need.
 
  1. In Visual Studio, create a new project and select the **Console App** project type.
- 2. Select **.NET 6.0 (Long Term Support)** from the Framework dropdown.
+ 2. Select **.NET 8.0 (Long Term Support)** from the Framework dropdown.
  3. Set the project name to **ClientUI**.
  4. Set the solution name to **RetailDemo**.
 

tutorials/quickstart/Snippets/Core_8/Core_8.csproj renamed to tutorials/quickstart/Snippets/Core_9/Core_9.csproj

@@ -1,12 +1,12 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
-	<TargetFramework>net6.0</TargetFramework>
-    <LangVersion>10.0</LangVersion>
+	<TargetFramework>net8.0</TargetFramework>
+    <LangVersion>12.0</LangVersion>
   </PropertyGroup>
   <ItemGroup>
-	<PackageReference Include="NServiceBus" Version="8.*" />
-	<PackageReference Include="NServiceBus.Extensions.Hosting" Version="2.*" />
-	<PackageReference Include="NServiceBus.Heartbeat" Version="4.*" />
-	<PackageReference Include="NServiceBus.Metrics.ServiceControl" Version="4.*" />
+	<PackageReference Include="NServiceBus" Version="9.*" />
+	<PackageReference Include="NServiceBus.Extensions.Hosting" Version="3.*" />
+	<PackageReference Include="NServiceBus.Heartbeat" Version="5.*" />
+	<PackageReference Include="NServiceBus.Metrics.ServiceControl" Version="5.*" />
   </ItemGroup>
 </Project>

tutorials/quickstart/Snippets/Core_8/OrderPlacedHandler.cs renamed to tutorials/quickstart/Snippets/Core_9/OrderPlacedHandler.cs

@@ -3,7 +3,7 @@ Microsoft Visual Studio Solution File, Format Version 12.00
 # Visual Studio Version 16
 VisualStudioVersion = 16.0.29728.190
 MinimumVisualStudioVersion = 15.0.26730.12
-Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Core_8", "Core_8\Core_8.csproj", "{10CE989A-8E4F-400C-8BBD-3935B9FEE695}"
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Core_9", "Core_9\Core_9.csproj", "{10CE989A-8E4F-400C-8BBD-3935B9FEE695}"
 EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution