Bump Shouldly from 4.1.0 to 4.2.0 (#294)

Bumps [Shouldly](https://github.com/shouldly/shouldly) from 4.1.0 to 4.2.0.
- [Release notes](https://github.com/shouldly/shouldly/releases)
- [Changelog](https://github.com/shouldly/shouldly/blob/master/BREAKING%20CHANGES.txt)
- [Commits](shouldly/shouldly@4.1.0...4.2.0)

---
updated-dependencies:
- dependency-name: Shouldly
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

src/PublicApiGeneratorTests/PublicApiGeneratorTests.csproj

@@ -34,7 +34,7 @@
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
     </PackageReference>
-    <PackageReference Include="Shouldly" Version="4.1.0" />
+    <PackageReference Include="Shouldly" Version="4.2.0" />
   </ItemGroup>
 
   <ItemGroup>