Log Message:
p5-Future: update to 0.47.

0.47    2021-01-01
        [BUGFIXES]
         * Don't weaken() the waiting future in Future::Mutex as that causes
           it to be dropped in some situations

0.46    2020-10-19
        [CHANGES]
         * Provide AWAIT_CHAIN_CANCEL named method for compatibility with
           upcoming Future::AsyncAwait::Awaitable method rename

        [BUGFIXES]
         * Ensure that Future::Mutex returns proper cloned future instances
           when waiting (RT133563)