Bump concurrent-ruby from 1.1.6 to 1.1.9

[dependabot]

Bumps concurrent-ruby from 1.1.6 to 1.1.9.

Changelog

Sourced from concurrent-ruby's changelog.

Release v1.1.9 (5 Jun 2021)

concurrent-ruby:

• (#866) Child promise state not set to :pending immediately after #execute when parent has completed
• (#905, #872) Fix RubyNonConcurrentPriorityQueue#delete method
• (2df0337d) Make sure locks are not shared on shared when objects are dup/cloned
• (#900, #906, #796, #847, #911) Fix Concurrent::Set tread-safety issues on CRuby
• (#907) Add new ConcurrentMap backend for TruffleRuby

Release v1.1.8 (20 January 2021)

concurrent-ruby:

• (#885) Fix race condition in TVar for stale reads
• (#884) RubyThreadLocalVar: Do not iterate over hash which might conflict with new pair addition

Release v1.1.7 (6 August 2020)

concurrent-ruby:

• (#879) Consider falsy value on Concurrent::Map#compute_if_absent for fast non-blocking path
• (#876) Reset Async queue on forking, makes Async fork-safe
• (#856) Avoid running problematic code in RubyThreadLocalVar on MRI that occasionally results in segfault
• (#853) Introduce ThreadPoolExecutor without a Queue

Commits

• 52c08fc Fix wrong class
• f47e300 Fix testing on different Ruby versions
• 229a051 Add missing sections
• 0fdf0e2 Update documentation
• 5f06b9b Update building instructions
• d3892de bump version
• 08f60ee Update changelog
• 0ace358 Make sure locks are not shared on shared when objects are dup/cloned
• b57b483 Merge pull request #866 from pelly/master
• 663fe73 Merge pull request #905 from andrykonchin/fix-priority-queue
• Additional commits viewable in compare view

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