Bump Akka from 1.5.51 to 1.5.55#127

dependabot[bot] wants to merge 1 commit intodevAaronontheweb/link-validator:devfrom

dependabot/nuget/src/Akka-1.5.55Aaronontheweb/link-validator:dependabot/nuget/src/Akka-1.5.55Copy head branch name to clipboard