chore(deps): update dependency verify.nunit to 31.0.4

Author: renovate[bot]

src/ReactiveUI.Validation.Tests/ReactiveUI.Validation.Tests.csproj

@@ -16,7 +16,7 @@
     <PackageReference Include="NUnit.Analyzers" Version="4.10.0" />
     <PackageReference Include="Microsoft.Reactive.Testing" Version="6.1.0" />
     <PackageReference Include="PublicApiGenerator" Version="11.4.6" />
-    <PackageReference Include="Verify.NUnit" Version="31.0.1" />
+    <PackageReference Include="Verify.NUnit" Version="31.0.4" />
     <PackageReference Include="coverlet.msbuild" Version="6.0.4">
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers</IncludeAssets>