p5-Future: update to 0.50.

0.50    2023-03-17
        [CHANGES]
         * Swap all unit tests from `Test::More` to `Test2::V0`
         * Avoids test_requires on `Test::Refcount` or `Test::Fatal`

        [BUGFIXES]
         * Fix documentation minisynopsis on `->udata`
         * Set `@CARP_NOT` so that `AWAIT_GET` rethrow appears to come from
           the right location (RT145249)

0.49    2022-10-17
        [CHANGES]
         * Big reshuffle to move most code into Future/PP.pm in order to
           support an optional Future-XS distribution too
         * Attempt to load Future::XS by preference if it is available
         * Additional unit tests for cornercases of XS implementation
         * Remember to provide the AWAIT_WAIT API method
         * Migrated Future::Queue out into its own distribution

        [BUGFIXES]
         * Bugfixes and unit tests for convergents on pre-cancelled futures
           (RT144459)


(wiz)