`Faraday::Connection#authorization` is deprecated

Discovered via Sidekiq deprecation watcher: https://log.gprd.gitlab.net/goto/dcec0d70-a62d-11ed-9f43-e3784d7fe3ca

Warning:

WARNING: `Faraday::Connection#authorization` is deprecated; it will be removed in version 2.0.
While initializing your connection, use `#request(:authorization, ...)` instead.
See https://lostisland.github.io/faraday/middleware/authentication for more usage info.

Example: https://log.gprd.gitlab.net/app/discover#/doc/AWNABDRwNDuQHTm2tH6l/pubsub-sidekiq-inf-gprd-003291?id=uqI4MYcBR8eYS4p6EP3B

Proposal

Preferred solution: Remove the asana gem and replace the one call where it's used with a regular Gitlab::HTTP call.

Alternative: Update asana gem to the latest version (2.0.2)