Bump TUnit from 1.14.0 to 1.16.4

---
updated-dependencies:
- dependency-name: TUnit
  dependency-version: 1.16.4
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

src/Directory.Packages.props

@@ -9,6 +9,6 @@
         <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="18.0.1"/>
         <PackageVersion Include="Microsoft.SourceLink.GitHub" Version="10.0.103"/>
         <PackageVersion Include="Microsoft.Testing.Extensions.CodeCoverage" Version="18.4.1"/>
-        <PackageVersion Include="TUnit" Version="1.14.0"/>
+        <PackageVersion Include="TUnit" Version="1.16.4"/>
     </ItemGroup>
 </Project>