Update .NET SDK to 8.0.100-preview.4.23260.5 (#416)

* Update .NET SDK

Update .NET SDK to version 8.0.100-preview.4.23260.5.

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

Signed-off-by: costellobot <102549341+costellobot@users.noreply.github.com>

* Bump Microsoft.AspNetCore.Mvc.Testing from 8.0.0-preview.3.23177.8 to 8.0.0-preview.4.23260.4

Bumps Microsoft.AspNetCore.Mvc.Testing from 8.0.0-preview.3.23177.8 to 8.0.0-preview.4.23260.4.

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

Signed-off-by: costellobot <102549341+costellobot@users.noreply.github.com>

---------

Signed-off-by: costellobot <102549341+costellobot@users.noreply.github.com>

Directory.Packages.props

@@ -2,7 +2,7 @@
   <ItemGroup>
     <PackageVersion Include="coverlet.msbuild" Version="3.2.0" />
     <PackageVersion Include="GitHubActionsTestLogger" Version="2.1.0" />
-    <PackageVersion Include="Microsoft.AspNetCore.Mvc.Testing" Version="8.0.0-preview.3.23177.8" />
+    <PackageVersion Include="Microsoft.AspNetCore.Mvc.Testing" Version="8.0.0-preview.4.23260.4" />
     <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="17.6.0" />
     <PackageVersion Include="Microsoft.SourceLink.GitHub" Version="1.1.1" />
     <PackageVersion Include="Moq" Version="4.18.4" />

global.json

@@ -1,6 +1,6 @@
 {
   "sdk": {
-    "version": "8.0.100-preview.3.23178.7",
+    "version": "8.0.100-preview.4.23260.5",
     "allowPrerelease": false,
     "rollForward": "latestMajor"
   }