chore(deps): update dependency tunit.core to 1.3.15 (#866)

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

Author: renovate[bot]

Directory.Packages.props

@@ -24,7 +24,7 @@
     <PackageVersion Include="NUnit.Analyzers" Version="4.11.2" />
     <PackageVersion Include="PublicApiGenerator" Version="11.5.3" />
     <PackageVersion Include="TUnit" Version="1.3.0" />
-    <PackageVersion Include="TUnit.Core" Version="1.3.9" />
+    <PackageVersion Include="TUnit.Core" Version="1.3.15" />
     <PackageVersion Include="Verify.MSTest" Version="31.7.3" />
     <PackageVersion Include="Verify.NUnit" Version="31.7.3" />
     <PackageVersion Include="Verify.TUnit" Version="31.7.3" />