chore(deps): bump concurrent-ruby from 1.3.3 to 1.3.8 in /example

[dependabot]

Bumps concurrent-ruby from 1.3.3 to 1.3.8.

Release notes

Sourced from concurrent-ruby's releases.

v1.3.8

What's Changed

• Programatically set the backtrace_location on exception by @​Edouard-chin in ruby-concurrency/concurrent-ruby#1107
• Allow to use Concurrent::Map#compute_if_absent in a Ractor by @​Edouard-chin in ruby-concurrency/concurrent-ruby#1109

New Contributors

• @​Edouard-chin made their first contribution in ruby-concurrency/concurrent-ruby#1107

Full Changelog: ruby-concurrency/concurrent-ruby@v1.3.7...v1.3.8

v1.3.7

There are 3 security fixes in this release, so updating is recommended. These security vulnerabilities are not very likely to be hit in practice and have a corresponding Low severity score.

What's Changed

• CVE-2026-54904 AtomicReference#update livelocks when the stored value is Float::NAN. Fix by @​joshuay03 and @​eregon
• CVE-2026-54905 ReentrantReadWriteLock read-count overflow grants a write lock without exclusivity. Fix by @​joshuay03
• CVE-2026-54906 ReadWriteLock allows wrong-thread write release and stray read-release counter corruption. Fix by @​joshuay03
• concurrent-ruby-ext: fix build on Darwin 32-bit by @​barracuda156 in ruby-concurrency/concurrent-ruby#1064
• Add SECURITY.md by @​eregon in ruby-concurrency/concurrent-ruby#1104
• Add Ruby 4.0 in CI by @​eregon in ruby-concurrency/concurrent-ruby#1106

New Contributors

• @​barracuda156 made their first contribution in ruby-concurrency/concurrent-ruby#1064

Full Changelog: ruby-concurrency/concurrent-ruby@v1.3.6...v1.3.7

v1.3.6

What's Changed

• Run tests without the C extension in CI by @​eregon in ruby-concurrency/concurrent-ruby#1081
• Fix typo in Promise docs by @​danieldiekmeier in ruby-concurrency/concurrent-ruby#1083
• Correct word in readme by @​wwahammy in ruby-concurrency/concurrent-ruby#1084
• Fix mistakes in MVar documentation by @​trinistr in ruby-concurrency/concurrent-ruby#1087
• Fix multi require concurrent/executor/cached_thread_pool by @​OuYangJinTing in ruby-concurrency/concurrent-ruby#1085
• Use typed data APIs by @​nobu in ruby-concurrency/concurrent-ruby#1096
• Add Joshua Young to the list of maintainers by @​eregon in ruby-concurrency/concurrent-ruby#1097
• Asynchronous pruning for RubyThreadPoolExecutor by @​joshuay03 in ruby-concurrency/concurrent-ruby#1082
• Mark RubySingleThreadExecutor as a SerialExecutorService by @​meineerde in ruby-concurrency/concurrent-ruby#1070
• Allow TimerTask to be safely restarted after shutdown and avoid duplicate tasks by @​bensheldon in ruby-concurrency/concurrent-ruby#1001

... (truncated)

Changelog

Sourced from concurrent-ruby's changelog.

Release v1.3.8 (19 July 2026)

concurrent-ruby:

• See the release notes on GitHub.

Release v1.3.7 (16 June 2026)

concurrent-ruby:

• See the release notes on GitHub.

Release v1.3.6 (13 December 2025)

concurrent-ruby:

• See the release notes on GitHub.

Release v1.3.5, edge v0.7.2 (15 January 2025)

concurrent-ruby:

• (#1062) Remove dependency on logger.

concurrent-ruby-edge:

• (#1062) Remove dependency on logger.

Release v1.3.4 (10 August 2024)

• (#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.

Commits

• 0b88d5f Release 1.3.8
• 0f83a98 Allow to use Concurrent::Map#compute_if_absent in a Ractor (#1109)
• cc5a32f Programatically set the backtrace_location on exception:
• 4c8fc28 Release 1.3.7
• d91ca94 Fix AtomicReference#update livelock when stored value is Float::NAN on JRuby ...
• 7e4d711 Fix ReentrantReadWriteLock read hold overflow into write-lock bit
• 6e37e06 Fix AtomicReference#update livelock when stored value is Float::NAN
• 2825cfa Cleanup spec
• 3fd4932 Fix ReadWriteLock wrong-thread write release and stray read release
• 1974b47 Add Ruby 4.0 in CI
• Additional commits viewable in compare view

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