Bump bdk version to 0.24.0

[notmandatory]

Description

Update BDK to the latest version, 0.24.0.

Notes to the reviewers

I also had to add base64 as a new dependency because it's not exported by bdk.

There's probably a more elegant way to fix the wasm.rs compiler function for descriptor.translate_pk, and I don't know how create a unit test it since it only runs on wasm32. But at least it builds so I think that's close enough for now.

Checklists

All Submissions:

• [x] I've signed all my commits
• [x] I followed the contribution guidelines
• [x] I ran cargo fmt and cargo clippy before committing

[notmandatory]

This is ready to review, but can't be merged until after bdk 0.24.0 is released.

[notmandatory]

This needs to be updated once bitcoindevkit/bdk-reserves#16 is merged and released.