deps(nuget): Bump the testing group with 2 updates (#88)

Updated
[coverlet.collector](https://github.com/coverlet-coverage/coverlet) from
6.0.2 to 6.0.4.

<details>
<summary>Release notes</summary>

_Sourced from [coverlet.collector's
releases](https://github.com/coverlet-coverage/coverlet/releases)._

## 6.0.4

### Fixed
- Fix empty coverage report when using include and exclude filters
[#​1726](coverlet-coverage/coverlet#1726)

[Diff between 6.0.3 and
6.0.4](coverlet-coverage/coverlet@v6.0.3...v6.0.4)

## 6.0.3

### Fixed
- Fix RuntimeConfigurationReader to support self-contained builds
[#​1705](coverlet-coverage/coverlet#1705) by
https://github.com/pfeigl
- Fix inconsistent filenames with UseSourceLink after .NET 8
[#​1679](coverlet-coverage/coverlet#1679)
- Fix hanging tests
[#​989](coverlet-coverage/coverlet#989)
- Fix coverlet instrumentation becomes slow after installing dotnet sdk
8.0.200
[#​1620](coverlet-coverage/coverlet#1620)
- Fix upgrading v6.0.1 to v6.0.2 increases instrumentation time
[#​1649](coverlet-coverage/coverlet#1649)
- Fix Unable to instrument module - NET 8
[#​1631](coverlet-coverage/coverlet#1631)
- Fix slow modules filtering process
[#​1646](coverlet-coverage/coverlet#1646) by
https://github.com/BlackGad
- Fix incorrect coverage await using in generic method
[#​1490](coverlet-coverage/coverlet#1490)

### Improvements
- Cache the regex used in InstrumentationHelper
[#​1693](coverlet-coverage/coverlet#1693)
- Enable dotnetTool integration tests for linux
[#​660](coverlet-coverage/coverlet#660)

[Diff between 6.0.2 and
6.0.3](coverlet-coverage/coverlet@v6.0.2...v6.0.3)

Commits viewable in [compare
view](coverlet-coverage/coverlet@v6.0.2...v6.0.4).
</details>

Updated [xunit](https://github.com/xunit/xunit) from 2.9.2 to 2.9.3.

<details>
<summary>Release notes</summary>

_Sourced from [xunit's
releases](https://github.com/xunit/xunit/releases)._

No release notes found for this version range.

Commits viewable in [compare
view](https://github.com/xunit/xunit/commits).
</details>

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JsonApiToolkit.Tests/JsonApiToolkit.Tests.csproj

@@ -7,12 +7,12 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="coverlet.collector" Version="6.0.2" />
+    <PackageReference Include="coverlet.collector" Version="6.0.4" />
     <PackageReference Include="Microsoft.AspNetCore.Mvc.Testing" Version="9.0.14" />
     <PackageReference Include="Microsoft.EntityFrameworkCore.InMemory" Version="9.0.14" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.14.1" />
     <PackageReference Include="moq" Version="4.20.72" />
-    <PackageReference Include="xunit" Version="2.9.2" />
+    <PackageReference Include="xunit" Version="2.9.3" />
     <PackageReference Include="xunit.runner.visualstudio" Version="3.1.5" />
   </ItemGroup>