chore(deps): update dependency verify.nunit to 31.8.0 (#869)

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

Author: renovate[bot]

Directory.Packages.props

@@ -26,7 +26,7 @@
     <PackageVersion Include="TUnit" Version="1.3.15" />
     <PackageVersion Include="TUnit.Core" Version="1.3.15" />
     <PackageVersion Include="Verify.MSTest" Version="31.8.0" />
-    <PackageVersion Include="Verify.NUnit" Version="31.7.3" />
+    <PackageVersion Include="Verify.NUnit" Version="31.8.0" />
     <PackageVersion Include="Verify.TUnit" Version="31.7.3" />
     <PackageVersion Include="Verify.XunitV3" Version="31.7.3" />
     <PackageVersion Include="xunit.runner.visualstudio" Version="3.1.5" />