Bump Newtonsoft.Json in /Tests/FluentAssertions.Json.Specs (#65)

Bumps [Newtonsoft.Json](https://github.com/JamesNK/Newtonsoft.Json) from 10.0.3 to 13.0.1.
- [Release notes](https://github.com/JamesNK/Newtonsoft.Json/releases)
- [Commits](JamesNK/Newtonsoft.Json@10.0.3...13.0.1)

---
updated-dependencies:
- dependency-name: Newtonsoft.Json
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

Src/FluentAssertions.Json/FluentAssertions.Json.csproj

@@ -36,7 +36,7 @@
     <PackageReference Include="FluentAssertions" Version="6.0.0" />
     <PackageReference Include="JetBrains.Annotations" Version="2021.3.0" PrivateAssets="all" />
     <PackageReference Include="Microsoft.SourceLink.GitHub" Version="1.1.1" PrivateAssets="All" />
-    <PackageReference Include="Newtonsoft.Json" Version="10.0.3" />
+    <PackageReference Include="Newtonsoft.Json" Version="13.0.1" />
     <None Include="..\FluentAssertions.png" Pack="true" Visible="false" PackagePath="" />
   </ItemGroup>
   <ItemGroup>

Tests/FluentAssertions.Json.Specs/FluentAssertions.Json.Specs.csproj

@@ -17,7 +17,7 @@
   <ItemGroup>
     <PackageReference Include="AutoFixture" Version="4.17.0" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.2.0" />
-    <PackageReference Include="Newtonsoft.Json" Version="10.0.3" />
+    <PackageReference Include="Newtonsoft.Json" Version="13.0.1" />
     <PackageReference Include="xunit" Version="2.4.1" />
     <PackageReference Include="xunit.runner.visualstudio" Version="2.4.0" />
     <PackageReference Include="coverlet.collector" Version="3.1.2" />