Bump StyleCop.Analyzers from 1.2.0-beta.507 to 1.2.0-beta.556

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>

Directory.Packages.props

@@ -6,7 +6,7 @@
     <PackageVersion Include="NUnit" Version="4.0.1" />
     <PackageVersion Include="NUnit.Analyzers" Version="3.10.0" />
     <PackageVersion Include="NUnit3TestAdapter" Version="4.5.0" />
-    <PackageVersion Include="StyleCop.Analyzers" Version="1.2.0-beta.507" />
+    <PackageVersion Include="StyleCop.Analyzers" Version="1.2.0-beta.556" />
     <PackageVersion Include="System.Collections.Immutable" Version="8.0.0" />
     <PackageVersion Include="CommandLineParser" Version="2.9.1" />
     <PackageVersion Include="BenchmarkDotNet" Version="0.13.11" />