Merge bitcoindevkit/bdk#1091: ci: Pin rustls-webpki to 0.100.1

Merge bitcoindevkit/bdk#1091: ci: Pin rustls-webpki to 0.100.1

fa0bead02488d2bcfb9828e61c06a36a3dab70d4 ci: Pin rustls-webpki to 0.100.1 (Daniela Brozzoni)

Pull request description:

  ### 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:
  notmandatory:
    ACK fa0bead02488d2bcfb9828e61c06a36a3dab70d4

Tree-SHA512: e8d0f21efef5abd222169bce2294e7de22699bd65e8366cd3e9c08e0858efd9163b4c428375b2a335c0358a0e7c591bd64899ee5c909cd09e0d14bfdda3d3633