Merge bitcoindevkit/bdk-cli#189: chore: update audit workflow to ubuntu-latest

Merge bitcoindevkit/bdk-cli#189: chore: update audit workflow to ubuntu-latest

7f6e2cfd2ca2527ec779ea7a8a997b5a925b2130 chore: update audit workflow to ubuntu-latest (Vihiga Tyonum)

Pull request description:

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  ### Description

  - update aud.yml workflow to use the latest ubuntu

  <!-- Describe the purpose of this PR, what's being adding and/or fixed -->

  #### 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 7f6e2cfd2ca2527ec779ea7a8a997b5a925b2130

Tree-SHA512: 12c0704a14beb663bcc82677eec4bcc35b173bfdc2cd8d2f612c6eaab92540fad082062cec031ed628722ee7b84017da67d3ee802d893a4c3edeb9f77ad000a1