Log Message:
devel/ruby-concurrent-ruby: update to 1.2.0

1.2.0 (2023-01-23)

* (#975) Set the Ruby compatibility version at 2.3
* (#962) Fix ReentrantReadWriteLock to use the same granularity for locals
  as for Mutex it uses.
* (#983) Add FiberLocalVar
* (#934) concurrent-ruby now supports requiring individual classes (public
  classes listed in the docs), e.g., require 'concurrent/map'
* (#976) Let Promises.any_fulfilled_future take an Event
* Improve documentation of various classes
* (#972) Remove Rubinius-related code