chore(deps): Bump StyleCop.Analyzers.Unstable

Bumps [StyleCop.Analyzers.Unstable](https://github.com/DotNetAnalyzers/StyleCopAnalyzers) from 1.2.0.507 to 1.2.0.556.
- [Release notes](https://github.com/DotNetAnalyzers/StyleCopAnalyzers/releases)
- [Changelog](https://github.com/DotNetAnalyzers/StyleCopAnalyzers/blob/master/documentation/KnownChanges.md)
- [Commits](https://github.com/DotNetAnalyzers/StyleCopAnalyzers/commits)

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

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

src/Escendit.Tools.CodeAnalysis.StyleCopAnalyzers/Escendit.Tools.CodeAnalysis.StyleCopAnalyzers.csproj

@@ -10,7 +10,7 @@
         <PackageTags>analyzers;stylecop;defaults</PackageTags>
     </PropertyGroup>
     <ItemGroup>
-        <PackageReference Include="StyleCop.Analyzers.Unstable" Version="1.2.0.507">
+        <PackageReference Include="StyleCop.Analyzers.Unstable" Version="1.2.0.556">
             <PrivateAssets>runtime; build; native; contentfiles</PrivateAssets>
             <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
         </PackageReference>