Update dependency nunit to v3.13.3

Author: renovate[bot]

tests/Tests.csproj

@@ -5,7 +5,7 @@
         <PackageReference Include="FluentAssertions" Version="5.10.3" />
         <PackageReference Include="NSubstitute" Version="4.2.2" />
         <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.10.0" />
-        <PackageReference Include="nunit" Version="3.13.2" />
+        <PackageReference Include="nunit" Version="3.13.3" />
         <PackageReference Include="NUnit3TestAdapter" Version="4.0.0" />
         <PackageReference Include="RichardSzalay.MockHttp" Version="6.0.0" />
     </ItemGroup>