Bump .NET NuGet packages

Bumps .NET dependencies to their latest versions for the .NET 8.0.204 SDK.

Bumps Microsoft.AspNetCore.Mvc.Testing from 8.0.3 to 8.0.4.
Bumps Microsoft.EntityFrameworkCore.InMemory from 8.0.3 to 8.0.4.

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

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

Directory.Packages.props

@@ -2,9 +2,9 @@
   <ItemGroup>
     <PackageVersion Include="Humanizer" Version="2.14.1" />
     <PackageVersion Include="MartinCostello.Logging.XUnit" Version="0.3.0" />
-    <PackageVersion Include="Microsoft.AspNetCore.Mvc.Testing" Version="8.0.3" />
+    <PackageVersion Include="Microsoft.AspNetCore.Mvc.Testing" Version="8.0.4" />
     <PackageVersion Include="Microsoft.DotNet.XliffTasks" Version="1.0.0-beta.21452.1" />
-    <PackageVersion Include="Microsoft.EntityFrameworkCore.InMemory" Version="8.0.3" />
+    <PackageVersion Include="Microsoft.EntityFrameworkCore.InMemory" Version="8.0.4" />
     <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="17.9.0" />
     <PackageVersion Include="PseudoLocalizer.Humanizer" Version="0.9.0" />
     <PackageVersion Include="Shouldly" Version="4.2.1" />