Bump Shouldly from 4.2.1 to 4.3.0 in /Source

Bumps [Shouldly](https://github.com/shouldly/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)

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

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

Author: dependabot[bot]

Source/EasyNetQ.Management.Client.ApprovalTests/EasyNetQ.Management.Client.ApprovalTests.csproj

@@ -11,7 +11,7 @@
 
   <ItemGroup>
     <PackageReference Include="PublicApiGenerator" Version="11.1.0" />
-    <PackageReference Include="Shouldly" Version="4.2.1" />
+    <PackageReference Include="Shouldly" Version="4.3.0" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.10.0" />
     <PackageReference Include="xunit" Version="2.8.1" />
     <PackageReference Include="xunit.runner.visualstudio" Version="2.8.1">