Bump Verify.Nunit from 27.0.0-beta.5 to 27.0.0-beta.6 in /src (#289)

Author: dependabot[bot]

src/Directory.Packages.props

@@ -12,6 +12,6 @@
     <PackageVersion Include="Polyfill" Version="6.14.0" />
     <PackageVersion Include="ProjectDefaults" Version="1.0.138" />
     <PackageVersion Include="Verify" Version="27.0.0-beta.6" />
-    <PackageVersion Include="Verify.Nunit" Version="27.0.0-beta.5" />
+    <PackageVersion Include="Verify.Nunit" Version="27.0.0-beta.6" />
   </ItemGroup>
 </Project>