Release 14.3.0 into trunk

[iangmaia]

Releasing new version 14.3.0.

What's Next

PR Author: Be sure to create and publish a GitHub Release pointing to trunk once this PR gets merged,
copy/pasting the following text as the GitHub Release's description:

### New Features

- Added optional `next_version` parameter to `android_update_release_notes` and `ios_update_release_notes` actions, allowing callers to provide the next version directly instead of relying on the built-in calculator that assumes minor version caps at 9. This fixes incorrect version bumps (e.g., 8.9 → 9.0 instead of 8.10) for apps using semantic versioning. [#706]