Bump bdk-ffi submodule to 0.7.0 and update tests

[thunderbiscuit]

Description

This PR is the migration to bdk-ffi 0.7.0, and updates to the test suite.

Notes to the reviewers

Both test suites have been upgraded.

Checklist

• I've signed all my commits
• I followed the contribution guidelines

[thunderbiscuit]

The tests seem to fail because of the ring dependency (not coming from bdk directly nor from uniffir-rs so not exactly sure where).

error: failed to run custom build command for `ring v0.16.20`

[notmandatory]

I was able to reproduce this issue locally by changing my ANDROID_NDK_ROOT environment to the same as github actions seems to be using now. I suspect they changed it recently.

export ANDROID_NDK_ROOT=/home/steve/Android/Sdk/ndk/23.2.8568313

If in the test.yaml file you can hard code the environment variable to:

env:
     ANDROID_NDK_ROOT: /usr/local/lib/android/sdk/ndk/21.4.7075529

Then it should work. You can find the current github actions VM installed software versions here;

[notmandatory]

ACK 5f2297e