Update .NET SDK to 8.0.400 (#226)

* Update .NET SDK

Update .NET SDK to version 8.0.400.

---
updated-dependencies:
- dependency-name: Microsoft.NET.Sdk
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: aspnet-contrib-service-account[bot] <161750942+aspnet-contrib-service-account[bot]@users.noreply.github.com>

* Bump .NET NuGet packages

Bumps .NET dependencies to their latest versions for the .NET 8.0.400 SDK.

Bumps Microsoft.AspNetCore.Mvc.Testing from 8.0.7 to 8.0.8.
Bumps Microsoft.AspNetCore.TestHost from 8.0.7 to 8.0.8.

---
updated-dependencies:
- dependency-name: Microsoft.AspNetCore.Mvc.Testing
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: Microsoft.AspNetCore.TestHost
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: aspnet-contrib-service-account[bot] <161750942+aspnet-contrib-service-account[bot]@users.noreply.github.com>

---------

Signed-off-by: aspnet-contrib-service-account[bot] <161750942+aspnet-contrib-service-account[bot]@users.noreply.github.com>
Co-authored-by: aspnet-contrib-service-account[bot] <161750942+aspnet-contrib-service-account[bot]@users.noreply.github.com>

Directory.Packages.props

@@ -5,8 +5,8 @@
     <PackageVersion Include="JetBrains.Annotations" Version="2024.2.0" />
     <PackageVersion Include="JustEat.HttpClientInterception" Version="4.3.0" />
     <PackageVersion Include="MartinCostello.Logging.XUnit" Version="0.4.0" />
-    <PackageVersion Include="Microsoft.AspNetCore.Mvc.Testing" Version="8.0.7" />
-    <PackageVersion Include="Microsoft.AspNetCore.TestHost" Version="8.0.7" />
+    <PackageVersion Include="Microsoft.AspNetCore.Mvc.Testing" Version="8.0.8" />
+    <PackageVersion Include="Microsoft.AspNetCore.TestHost" Version="8.0.8" />
     <PackageVersion Include="Microsoft.IdentityModel.Protocols" Version="7.0.3" />
     <PackageVersion Include="Shouldly" Version="4.2.1" />
   </ItemGroup>

global.json

@@ -1,12 +1,12 @@
 {
   "sdk": {
-    "version": "8.0.303",
+    "version": "8.0.400",
     "allowPrerelease": true,
     "rollForward": "major"
   },
 
   "tools": {
-    "dotnet": "8.0.303"
+    "dotnet": "8.0.400"
   },
 
   "msbuild-sdks": {