chore(main): release 5.2.1

[github-actions[bot]]

:robot: I have created a release beep boop

5.2.1 (2024-06-05)

Bug Fixes

• fixes issue where first flag listener callback was not triggered… (#97) (6bf8ec1)

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[github-actions[bot]]

:robot: Release is at https://github.com/launchdarkly/dotnet-client-sdk/releases/tag/5.2.1 :sunflower: