Braintree Blue now requires v4.11.0, but braintree_blue.rb only checks for a version greater than 2.

[kahnyoudiggit]

In v1.137.0 a call to network_token_details was added the braintree_blue class. This requires consumers to also have version 4.11.0 or greater of the braintree gem, but there are no safeguards to enforce that.

[github-actions]

To provide a cleaner slate for the maintenance of the library, this PR/Issue is being labeled stale after 60 days without activity. It will be closed in 14 days unless you comment with an update regarding its applicability to the current build. Thank you!