Merge bitcoindevkit/bdk-cli#235: CI: Update `continous_integration` and `audit` workflows

aba4b950aa95f52d277035a7016116828ee29c4e CI: Fix clippy issues (Vihiga Tyonum)
cc3c8a280cf9c38d2f0fafd1af916a650ca89cf6 ci: Update audit workflow and `bytes` dependency (Vihiga Tyonum)
e39e59c339903b213696f97004e93a951ecfb4de ci: add prepush checks that mirrors ci workflow (Vihiga Tyonum)
e849f8e315a24267b2cd9c4c6a5d37a3d9c323d0 chore: fix clippy warnings (Vihiga Tyonum)
8d20cf270d7e9fee71857135cb94b0d22a4b6565 ci: update cont_integration workflow (Vihiga Tyonum)

Pull request description:

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  ### Description

  This PR updates the continuous integration workflow and fixes some Clippy issues.

  Also fixes #239

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

  ### 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 -->
  - update `actions/checkout` to v6
  - add a separate job for Clippy
  - automate manual caching in the `build-test` job
  - replace `actions-r/toolchain` with `actions-rust-
  lang/setup-rust-toolchain` for toolchain setup
  -fix clippy warnings
  - add prepush command to Justfile
  - Add `tool-version` parameter in audit workflow that forces the `actions-rust-lang/audit` to use a version that supports CVSS 4.0
  - update transitive dependency `bytes` to v1.11.1

  ## Changelog notice

  <!-- Notice the release manager should include in the release tag message changelog -->
  <!-- See https://keepachangelog.com/en/1.0.0/ for examples -->

  ### Checklists

  #### 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

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Tree-SHA512: 24ac0771d7e14ea54137fa355b84328bbc0a36c3ab3602f9e07062fca348642e44c2cfca10103a78edf3564618db4111700ac89e0967464dd9a084966373a474