Merge bitcoindevkit/bdk#869: Bump version to 0.27.1

Merge bitcoindevkit/bdk#869: Bump version to 0.27.1

231a1fba61c56c7d43c3a7d8d41af1f3b8aa4c3f Bump version to 0.27.1 (Steve Myers)

Pull request description:

  ### Description

  Bump dev version to 0.27.1.

  ### Notes to the reviewers

  This is in preparation for making a patch release and will be cherry picked to the release/0.27 branch. See #868.

  ### Changelog notice

  ### Checklists

  #### All Submissions:

  * [x] I've signed all my commits
  * [x] I followed the [contribution guidelines](https://github.com/bitcoindevkit/bdk/blob/master/CONTRIBUTING.md)
  * [x] I ran `cargo fmt` and `cargo clippy` before committing

Top commit has no ACKs.

Tree-SHA512: 7c791d221d95fb800c19b85c110a47f462b1c9ea7991dc1cf9bc5bb17d12b2dea9d1823d7f928ba06f09aaac36b1140610a29454857257f918124e0e0893fc4e