[error] request--curl-sync: semaphore never called

[psionic-k]

https://www.reddit.com/r/emacs/comments/kgv4fj/problems_in_org_trello_error_requestcurlsync/

Intermittent. Likely fetching the license.

(setq request-backend 'url-retrieve) seems fine. Not going to let bind this around the call until I stop seeing the intermittent issue.