Bump ServiceStack from 5.0.0 to 5.9.2 in /DeepCloner.Tests

Bumps [ServiceStack](https://github.com/ServiceStack/ServiceStack) from 5.0.0 to 5.9.2.
- [Release notes](https://github.com/ServiceStack/ServiceStack/releases)
- [Commits](ServiceStack/ServiceStack@v5...v5.9.2)

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

Author: dependabot[bot]

DeepCloner.Tests/DeepCloner.Tests.Core.csproj

@@ -24,7 +24,7 @@
     <PackageReference Include="FastDeepCloner" Version="1.0.9" />
     <PackageReference Include="DesertOctopus" Version="0.1.1" />
     <PackageReference Include="EntityFramework" Version="6.1.3" />
-    <PackageReference Include="ServiceStack" Version="5.0.0" />
+    <PackageReference Include="ServiceStack" Version="5.9.2" />
   </ItemGroup>
   <ItemGroup Condition=" '$(TargetFramework)' == 'netcoreapp2.0'">
       <PackageReference Include="Microsoft.EntityFrameworkCore.SqlServer" Version="1.1.2" />

DeepCloner.Tests/packages.config

@@ -10,7 +10,7 @@
   <package id="NClone" version="1.1.1" targetFramework="net461" />
   <package id="Nuclex.Cloning" version="1.0.0.0" targetFramework="net40" />
   <package id="NUnit" version="3.6.0" targetFramework="net461" />
-  <package id="ServiceStack" version="5.0.0" targetFramework="net461" />
+  <package id="ServiceStack" version="5.9.2" targetFramework="net461" />
   <package id="ServiceStack.Client" version="5.0.0" targetFramework="net461" />
   <package id="ServiceStack.Common" version="5.0.0" targetFramework="net461" />
   <package id="ServiceStack.Interfaces" version="5.0.0" targetFramework="net461" />