Update TUnit to 1.20.0 (#2112)

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

Author: renovate[bot]

Directory.Packages.props

@@ -27,8 +27,8 @@
         <PackageVersion Include="JetBrains.ReSharper.GlobalTools" Version="2025.3.3" />
         <PackageVersion Include="Polyfill" Version="9.22.0" />
         <PackageVersion Include="Serilog.Sinks.Spectre" Version="0.5.0" />
-        <PackageVersion Include="TUnit" Version="1.19.74" />
-        <PackageVersion Include="TUnit.Core" Version="1.19.74" />
+        <PackageVersion Include="TUnit" Version="1.20.0" />
+        <PackageVersion Include="TUnit.Core" Version="1.20.0" />
         <PackageVersion Include="Verify.DiffPlex" Version="3.1.2" />
         <PackageVersion Include="GitVersion.Tool" Version="6.6.2" />
         <PackageVersion Include="Nuke.Common" Version="9.0.4" />