Merge bitcoindevkit/bdk#1259: Bump `bip39` dependency to v2.0

8694624bd5f63b738448c250d7b1042f219636da Bump `bip39` to v2.0 (Elias Rohrer)

Pull request description:

  We previously bumped the `bip39` version to 2.0 [in the 0.2X release branch](https://github.com/bitcoindevkit/bdk/pull/875). Back then, bumping it in `master` was [assumed unnecessary](https://github.com/bitcoindevkit/bdk/pull/875#issuecomment-1483990088). It seems this was erroneous, as the current `1.0.1` dependency is present since https://github.com/bitcoindevkit/bdk/pull/793, which was merged before the bump in `release/0.27`.

  Here, we therefore bump the crate version in `master` after all.

ACKs for top commit:
  notmandatory:
    ACK 8694624bd5f63b738448c250d7b1042f219636da

Tree-SHA512: a109219bc97bb8e965e8b10e72439aa898b710d1d1a154801ce499ad47475a6b23448d85e0de3f306f990573d1fccdae7d587ed41676a01f91d66a719782eae1