Bump Shouldly from 4.2.1 to 4.3.0 in /src

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]

src/Directory.Packages.props

@@ -28,7 +28,7 @@
     <PackageVersion Include="Serilog.Sinks.Debug" Version="3.0.0" />
     <PackageVersion Include="Serilog.Sinks.File" Version="6.0.0" />
     <PackageVersion Include="seriloganalyzer" Version="0.15.0" />
-    <PackageVersion Include="Shouldly" Version="4.2.1" />
+    <PackageVersion Include="Shouldly" Version="4.3.0" />
     <PackageVersion Include="StyleCop.Analyzers" Version="1.1.118" />
     <PackageVersion Include="System.Net.Http" Version="4.3.4" />
     <PackageVersion Include="TextCopy" Version="6.2.1" />