[SDK Sentinel] Fix custom slot supplier GC teardown crash - #569

[SDK Sentinel] Fix custom slot supplier GC teardown crash#569

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temporalio:maintemporalio/sdk-ruby:mainfrom

sdk-sentinel-forks:automation/sdk-sentinel/ci-flake/ruby/33931891751-1-b8a8d6d7e74fsdk-sentinel-forks/sdk-ruby:automation/sdk-sentinel/ci-flake/ruby/33931891751-1-b8a8d6d7e74fCopy head branch name to clipboard