chore(deps): update dependency tunit to 1.6.20 (#547)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

Directory.Packages.props

@@ -16,6 +16,6 @@
     <PackageVersion Include="NetEvolve.Arguments" Version="2.0.17" />
     <PackageVersion Include="NetEvolve.Extensions.TUnit" Version="3.3.2" />
     <PackageVersion Include="Polyfill" Version="9.4.1" />
-    <PackageVersion Include="TUnit" Version="1.6.15" />
+    <PackageVersion Include="TUnit" Version="1.6.20" />
   </ItemGroup>
 </Project>