Update `bdk` out of date dependencies

[notmandatory]

Where possible we should update out of date dependencies, including for dev and example projects.

https://deps.rs/repo/github/bitcoindevkit/bdk

Also tracking:

• [x] ~rusqlite~
• [ ] rand
• [ ] criterion
• [ ] hashbrown
• [ ] bincode
• [ ] tokio
• [ ] electrsd bitcoindevkit/bdk#1826
• [ ] ctrlc

[tnull]

• rusqlite

I'd be careful around this one, as you can't have multiple libsqlite3-sys versions in your dependency tree. In fact, I know that multiple projects kinda 'standardized' around the version currently used in BDK/CDK/LDK Node for this reason. So needlessly bumping the dependency would render BDK incompatible with all of these crates, requiring corresponding bumps and releases on all sides.

[notmandatory]

@tnull good call. I took it off the list.

[notmandatory]

Moving this to the 3.0 milestone when I hope we'll be able to bump to a higher MSRV which will make these updates easier.