chore: fix strong concurrency warnings

[marandaneto]

💡 Motivation and Context

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📝 Checklist

• I reviewed the submitted code.
• I added tests to verify the changes.
• I updated the docs if needed.
• No breaking change or entry added to the changelog.

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## Next
- fix strong concurrency warnings ([#128](https://github.com/PostHog/posthog-ios/pull/128))

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