Bump Shouldly from 4.2.1 to 4.3.0 (#657)

* Bump Shouldly and Microsoft.NETFramework.ReferenceAssemblies

Bumps [Shouldly](https://github.com/shouldly/shouldly) and [Microsoft.NETFramework.ReferenceAssemblies](https://github.com/Microsoft/dotnet). These dependencies needed to be updated together.

Updates `Shouldly` from 4.2.1 to 4.3.0
- [Release notes](https://github.com/shouldly/shouldly/releases)
- [Changelog](https://github.com/shouldly/shouldly/blob/master/BREAKING%20CHANGES.txt)
- [Commits](shouldly/shouldly@4.2.1...4.3.0)

Updates `Microsoft.NETFramework.ReferenceAssemblies` from 1.0.3 to 1.0.3
- [Commits](https://github.com/Microsoft/dotnet/commits)

---
updated-dependencies:
- dependency-name: Shouldly
  dependency-type: direct:production
  update-type: version-update:semver-minor
- dependency-name: Microsoft.NETFramework.ReferenceAssemblies
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

* Update Directory.Packages.props

---------

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

Author: dependabot[bot]

Directory.Packages.props

@@ -28,7 +28,7 @@
     <PackageVersion Include="Microsoft.VSSDK.BuildTools" Version="17.12.2069" />
     <PackageVersion Include="Newtonsoft.Json" Version="13.0.3" />
     <PackageVersion Include="MSBuild.ProjectCreation" Version="14.0.0" />
-    <PackageVersion Include="Shouldly" Version="4.2.1" />
+    <PackageVersion Include="Shouldly" Version="4.3.0" />
     <PackageVersion Include="System.Configuration.ConfigurationManager" Version="$(SystemConfigurationConfigurationManagerPackageVersion)" />
     <PackageVersion Include="xunit" Version="2.9.2" />
     <PackageVersion Include="xunit.runner.visualstudio" Version="2.8.2" />
@@ -48,4 +48,4 @@
     <GlobalPackageReference Include="Nerdbank.GitVersioning" Version="3.6.146" />
     <GlobalPackageReference Include="StyleCop.Analyzers" Version="1.1.118" />
   </ItemGroup>
-</Project>
+</Project>