Update dependency NUnit to 4.2.2 (#709)

+semver:patch

Author: renovate[bot]

src/FluentNHibernate.Testing/FluentNHibernate.Testing.csproj

@@ -21,7 +21,7 @@
     <PackageReference Include="Microsoft.Data.Sqlite" Version="8.0.3" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.11.0" />
     <PackageReference Include="FakeItEasy" Version="8.3.0" />
-    <PackageReference Include="NUnit" Version="4.1.0" />
+    <PackageReference Include="NUnit" Version="4.2.2" />
     <PackageReference Include="NUnit.Analyzers" Version="4.2.0">
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>