Bump Shouldly from 3.0.2 to 4.0.3 in /src

Bumps [Shouldly](https://github.com/shouldly/shouldly) from 3.0.2 to 4.0.3.
- [Release notes](https://github.com/shouldly/shouldly/releases)
- [Changelog](https://github.com/shouldly/shouldly/blob/master/BREAKING%20CHANGES.txt)
- [Commits](https://github.com/shouldly/shouldly/commits)

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

Author: dependabot-preview[bot]

src/Cake.AzureDevOps.Tests/Cake.AzureDevOps.Tests.csproj

@@ -19,7 +19,7 @@
     <PackageReference Include="Cake.Testing" Version="1.0.0" />
     <PackageReference Include="Microsoft.TeamFoundationServer.Client" Version="16.143.2" />
     <PackageReference Include="Moq" Version="4.16.0" />
-    <PackageReference Include="Shouldly" Version="3.0.2" />
+    <PackageReference Include="Shouldly" Version="4.0.3" />
     <PackageReference Include="StyleCop.Analyzers" Version="1.1.118" />
     <PackageReference Include="xunit" Version="2.4.1" />
     <PackageReference Include="xunit.runner.visualstudio" Version="2.4.3" />