Bump Shouldly from 4.2.1 to 4.3.0 (#258)

---
updated-dependencies:
- dependency-name: Shouldly
  dependency-version: 4.3.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

source/OctoVersion.Tests/OctoVersion.Tests.csproj

@@ -10,7 +10,7 @@
 
   <ItemGroup>
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.0.1" />
-    <PackageReference Include="Shouldly" Version="4.2.1" />
+    <PackageReference Include="Shouldly" Version="4.3.0" />
     <PackageReference Include="TeamCity.VSTest.TestAdapter" Version="1.0.41" />
     <PackageReference Include="xunit" Version="2.9.3" />
     <PackageReference Include="xunit.runner.visualstudio" Version="2.8.2">