Upgrade to `rust-bitcoin` 0.32

[tnull]

In #3063 we bumped to rust-bitcoin 0.31.

Synced with BDK and they will make the move to 0.32 in the next release (bitcoindevkit/bdk#1422), which means we're not only free to upgrade but also should do so ASAP.

[tnull]

@jirijakes Are you already working on this or did you intend to soon? Otherwise I'm happy to pick this up next week.

[jirijakes]

@jirijakes Are you already working on this or did you intend to soon? Otherwise I'm happy to pick this up next week.

I have not started yet and I don't think I would get to it before second half of June. So, please feel free to start.

[tnull]

I have not started yet and I don't think I would get to it before second half of June. So, please feel free to start.

Alright, then I'll see to pick it up soon. Thanks!

[TheBlueMatt]

We should probably first finish our upgrade to 0.31 by bumping our bech32 dependency.

[TheBlueMatt]

Done in #3239