chore(v9): release 9.7.1

[github-actions[bot]]

:robot: I have created a release beep boop

9.7.1 (2024-05-16)

Bug Fixes

• adds multithread protections for LDClient.start(...) (#382) (8fd47e4)

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[github-actions[bot]]

:robot: Release is at https://github.com/launchdarkly/ios-client-sdk/releases/tag/9.7.1 :sunflower: