chore(deps): update dependency tunit to 1.5.6

Author: renovate[bot]

Directory.Packages.props

@@ -24,7 +24,7 @@
     <PackageVersion Include="NUnit3TestAdapter" Version="6.0.0" />
     <PackageVersion Include="NUnit.Analyzers" Version="4.11.2" />
     <PackageVersion Include="PublicApiGenerator" Version="11.5.4" />
-    <PackageVersion Include="TUnit" Version="1.5.1" />
+    <PackageVersion Include="TUnit" Version="1.5.6" />
     <PackageVersion Include="TUnit.Core" Version="1.5.1" />
     <PackageVersion Include="Verify.MSTest" Version="31.8.0" />
     <PackageVersion Include="Verify.NUnit" Version="31.8.0" />