chore(deps): update tunit to 1.55.0

Author: renovate[bot]

src/Directory.Packages.props

@@ -6,7 +6,7 @@
 
   <ItemGroup>
     <!-- Testing Framework -->
-    <PackageVersion Include="TUnit" Version="1.49.0" />
+    <PackageVersion Include="TUnit" Version="1.55.0" />
     <PackageVersion Include="Verify.TUnit" Version="31.19.0" />
     <PackageVersion Include="Verify.SourceGenerators" Version="2.5.0" />
     <PackageVersion Include="Microsoft.Testing.Extensions.CodeCoverage" Version="18.7.0" />