[SDKRLSD-1584] chore: release 3.9.0

[OnestarLee]

External Contributions

This project is not yet set up to accept pull requests from external contributors.

If you have a pull request that you believe should be accepted, please contact
the Developer Relations team [email protected] with details
and we'll evaluate if we can setup a CLA to allow for the contribution.

For Internal Contributors

[SDKRLSD-1584](https://sendbird.atlassian.net/browse/SDKRLSD-1584)

Description Of Changes

Features

• add optional support for @react-native-documents/picker
• support for react-native 0.77 or later

Bug Fixes

• resolve FlatList-related error on Metro 0.81.3

Types Of Changes

What types of changes does your code introduce to this project?
Put an x in the boxes that apply_

• Bugfix
• New feature
• Documentation (correction or otherwise)
• Cosmetics (whitespace, appearance (ex) Prettier)
• Build configuration
• Improvement (refactor code)
• Test

[OnestarLee]

/bot create ticket

[github-actions]

[Creating Ticket] Preparing https://github.com/sendbird/sendbird-uikit-react-native/actions/runs/14394180171

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 11.51%. Comparing base (7176a88) to head (1933978).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #233   +/-   ##
=======================================
  Coverage   11.51%   11.51%           
=======================================
  Files         358      358           
  Lines        8479     8479           
  Branches     2373     2390   +17     
=======================================
  Hits          976      976           
  Misses       7428     7428           
  Partials       75       75           

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[github-actions]

[Creating Ticket] In progress https://app.circleci.com/pipelines/github/sendbird/sdk-deployment/1140

[sendbird-sdk-deployment]

[Creating Ticket] 🔖 Done https://sendbird.atlassian.net/browse/SDKRLSD-1584