chore(deps): update dependency tunit to 1.21.0 (#605)

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

Author: renovate[bot]

Directory.Packages.props

@@ -16,7 +16,7 @@
   <ItemGroup>
     <PackageVersion Include="Microsoft.Testing.Extensions.CodeCoverage" Version="18.5.2" />
     <PackageVersion Include="NetEvolve.Extensions.TUnit" Version="3.5.3" />
-    <PackageVersion Include="TUnit" Version="1.20.0" />
+    <PackageVersion Include="TUnit" Version="1.21.0" />
     <PackageVersion Include="Verify.TUnit" Version="31.13.5" />
   </ItemGroup>
 </Project>