Merge bitcoindevkit/bdk#1745: ci: pin `rustls` dependency version to build with rust...

3cb5d35e1150ac2f9c0418757ff605fdbf324cee ci: pin `rustls` dependency version to build with rust 1.63 (Wei Chen)

Pull request description:

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  ### Description

  <!-- Describe the purpose of this PR, what's being adding and/or fixed -->
  `rustls` version 0.23.18 raised msrv to 1.71.
  Version 0.23.17 was pinned to CI to continue working.

  ### Notes to the reviewers

  <!-- In this section you can include notes directed to the reviewers, like explaining why some parts
  of the PR were done in a specific way -->

  ### Changelog notice

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  <!-- See https://keepachangelog.com/en/1.0.0/ for examples -->
  * Pinned rustls dependency version to build with rust 1.63.

  ### 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

ACKs for top commit:
  evanlinjin:
    ACK 3cb5d35e1150ac2f9c0418757ff605fdbf324cee

Tree-SHA512: cd060438fdc55eddf6c3b9fbebf4ba415a9d602a6b433352763d4f351dba3d91ce186cd00844dc5536dfe78ad0d191bb62e8f315c763884d0a57f1da0ce7c55c