Merge bitcoindevkit/bdk#1996: ci: pin `webpki-roots` for MSRV compatibility

Merge bitcoindevkit/bdk#1996: ci: pin `webpki-roots` for MSRV compatibility

e1c8891e599d0d3215ba4d86b61d49c083517c96 ci: pin `webpki-roots` for MSRV compatibility (Wei Chen)

Pull request description:

  ### Description

  This PR pins the `webpki-roots` crate to version 1.0.1 to maintain compatibility with our current MSRV.

  ### Changelog notice

  - Pin `webpki-roots` to 1.0.1 for MSRV compatibility.

  ### Checklists

  #### All Submissions:

  * [x] I followed the [contribution guidelines](https://github.com/bitcoindevkit/bdk/blob/master/CONTRIBUTING.md)

ACKs for top commit:
  oleonardolima:
    ACK e1c8891e599d0d3215ba4d86b61d49c083517c96
  evanlinjin:
    ACK e1c8891e599d0d3215ba4d86b61d49c083517c96

Tree-SHA512: 9849cf47f6c269b100374d4c32591ea0caa70f40f0249ead6e5364862f939efff1dffb612d5760622c6389d38874c7c238f4774c019e483ce6dcd826939d653d