Update dependency concurrent-ruby to v1.3.4

This MR contains the following updates:

Package	Type	Update	Change
concurrent-ruby (source, changelog)	ironbank-rubygems	patch	1.3.3 -> 1.3.4

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Release Notes

ruby-concurrency/concurrent-ruby (concurrent-ruby)

v1.3.4

Compare Source

• (#​1060) Fix bug with return value of Concurrent.available_processor_count when cpu.cfs_quota_us is -1.
• (#​1058) Add Concurrent.cpu_shares that is cgroups aware.

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