Merge bitcoindevkit/bdk#815: Bump CI Rust stable version to 1.65.0

fb76c9ed9a0764a1e82d5c12a5e8104e26ef0ee5 ci: bump rust stable version to 1.65.0 (Yuki Kishimoto)
3a782b3b0da3ffbb2ec2480feb39c3b9e09149fe Fix Clippy Rust 1.65 (Yuki Kishimoto)

Pull request description:

  ### Description

  * Fix clippy for Rust 1.65.0
  * Bump CI Rust stable version to 1.65.0

  ### 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:
  rajarshimaitra:
    ReACK fb76c9ed9a0764a1e82d5c12a5e8104e26ef0ee5

Tree-SHA512: 2f27915895cb203842831e525cc9efe0503269df07b7e58ab2a587e2991decf2990cb48abe8209c89cec5706a1d9c72387da532b70979ec100b5eed469051136