Bump submodules ot-br-posix, openthread and ot-nrf528xx

[yangsong-cnyn]

openthread cf1d23c11e684fa99c631d83edf0280bc40a9bce
ot-br-posix 44d4079f8024aa02ef5d23bf0a2b87fd2f9eddd0
ot-nrf528xx f1246db79ce0abeb729ddb9e5fc1d314faa78250

[gemini-code-assist]

Summary of Changes

Hello, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request focuses on synchronizing the project's dependencies by updating the versions of several key submodules. This ensures the project benefits from the latest features, bug fixes, and performance improvements from the openthread, ot-br-posix, and ot-nrf528xx components, maintaining compatibility and stability across the integrated systems.

Highlights

• Submodule Updates: The openthread, ot-br-posix, and ot-nrf528xx submodules have been updated to their latest specified commit IDs, ensuring the project uses the most recent versions of these dependencies.
• Changelog Entry: A new entry has been added to CHANGELOG.txt documenting the submodule updates with their respective commit IDs and the date 03/03/2026.

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Changelog

• CHANGELOG.txt
  • Added an entry for 03/03/2026 detailing the submodule updates for openthread, ot-br-posix, and ot-nrf528xx with their respective commit IDs.

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[gemini-code-assist]

Code Review

This pull request updates the openthread, ot-br-posix, and ot-nrf528xx submodules to newer commits. The CHANGELOG.txt file has been updated accordingly to reflect these changes. The changes are straightforward and consistent with the repository's practices for submodule updates.

[Nitin-GRL]

@jwhui If there are no concerns, could this PR be merged soon?