Automatically update credits file with latest licence information

[Octobob]

This is an automated update of the credits / license attribution file, based on the latest code in https://github.com/OctopusDeploy/OctopusDeploy.

Please review for

• syntactical correctness (ie, markdown looks correct)
• logical correctness (ie, when reading it, it makes sense)
• license conformance (we agree with the license in question and we are able to redistribute it)

This pull request was created by TeamCity project Octofront_AutomatedDocumentationUpdates build 6276296