Merge #143: Bump bdk to v0.27.0

1bc4a76 Bump bdk and bdk-reserves to `v0.27.0` (rajarshimaitra)

Pull request description:

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  ### Description

  Upgrades to bdk `v0.27.0-rc.1`. Pins dependency `zip` to `v0.6`, as latest version of `zip` moved up their MSRV to `1.59`.

  ### Notes to the reviewers

  of the PR were done in a specific way -->

  ## Changelog notice

  <!-- Notice the release manager should include in the release tag message changelog -->
  <!-- See https://keepachangelog.com/en/1.0.0/ for examples -->
   - BDK version bumped to `0.27`.

  ### Checklists

  #### All Submissions:

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

ACKs for top commit:
  notmandatory:
    ACK 1bc4a76

Tree-SHA512: 65c34d55ce1f4afc69cd7d2466715791516ab3dca9f64e96428219f60b2c7449f26a0bce62eb672435be947619d1db48793f46334eece376882f6b4ac556269f

Author: notmandatory