deps: bdk-ffi 3.0.0 rc

[reez]

Description

https://github.com/bitcoindevkit/bdk-ffi/tree/release/3.0

Notes to the reviewers

Changelog notice

Checklists

All Submissions:

• I've signed all my commits
• I followed the contribution guidelines
• I have formatted my code with swift-format per .swift-format file

New Features:

• I've added tests for the new feature
• I've added docs for the new feature
• UI changes tested on small, medium, and large devices to ensure layout consistency

Bugfixes:

• This pull request breaks the existing API
• I've added tests to reproduce the issue which are now passing
• I'm linking the issue being fixed by this PR

[reez]

I have some local branches that expose new features (locking, etc) that I can add as follow ups

[reez]

official release

https://github.com/bitcoindevkit/bdk-swift/releases/tag/3.0.0