r-lib/mirai: mirai 2.7.1

Updates

• mirai's agent skill is now included in the installed package at skills and picked up automatically by btw and other packages following this convention.
• http_config() gains a headers argument, now the primary way to supply HTTP headers (including authentication such as session cookie, bearer token, or API key). cookie and token are retained as convenience arguments that append Cookie: and Authorization: Bearer entries to headers (thanks @ddl-dkelkhoff, #612).
• Reduces overhead for synchronous daemons by using an in-process transport.
• Fixes .handleSimpleError() appearing in $stack.trace on a miraiError (regression in mirai 2.7.0).
• Fixes load-balanced parallel functions (e.g. parLapplyLB(), foreach::%dopar%) hanging on a mirai cluster when there are more tasks than nodes, a regression in mirai 2.5.1 (thanks @manforkr, #591).