build(deps): bump StyleCop.Analyzers (#202)

Bumps [StyleCop.Analyzers](https://github.com/DotNetAnalyzers/StyleCopAnalyzers) from 1.2.0-beta.507 to 1.2.0-beta.556.
- [Release notes](https://github.com/DotNetAnalyzers/StyleCopAnalyzers/releases)
- [Changelog](https://github.com/DotNetAnalyzers/StyleCopAnalyzers/blob/master/documentation/KnownChanges.md)
- [Commits](DotNetAnalyzers/StyleCopAnalyzers@1.2.0-beta.507...1.2.0-beta.556)

---
updated-dependencies:
- dependency-name: StyleCop.Analyzers
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Directory.Build.props

@@ -8,7 +8,7 @@
     />
     <PackageReference 
       Include="StyleCop.Analyzers" 
-      Version="1.2.0-beta.507"
+      Version="1.2.0-beta.556"
       PrivateAssets="all" 
       Condition="$(MSBuildProjectExtension) == '.csproj'" 
     />