Merge bitcoindevkit/bdk#2089: ci: Swap `tibdex` for `actions/create-github-app-token...

ef4ae3cda4f48afcf0ba61908529a365669d9bb6 ci: Swap `tibdex` for `actions/create-github-app-token` in `cron-update-rust.yml` (valued mammal)

Pull request description:

  ### Description

  Move away from the now archived `tibdex/github-app-token` in `cron-update-rust.yml` workflow in favor of official [`actions/create-github-app-token`](https://github.com/marketplace/actions/create-github-app-token).

  fix #2072

  ### Checklists

  #### All Submissions:

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

ACKs for top commit:
  oleonardolima:
    ACK ef4ae3cda4f48afcf0ba61908529a365669d9bb6
  luisschwab:
    ACK ef4ae3cda4f48afcf0ba61908529a365669d9bb6

Tree-SHA512: 70ceac0707055a33f1a27be55d0e8ba4d7f63db11270ed70be5966a8c1675a1d6ec3b14344d17406fb439d830be327b14f74270f084c49efa5e2096c5a392502