Merge bitcoindevkit/bdk#1164: ref(chain): Rename direct_conflicts_of_tx to direct_con...

d5c87c49a82c5cd3a4558e61fe9984f0ae8c6cb7 ref(chain): Rename direct_conflicts_of_tx to... ...direct_conflitcs (Daniela Brozzoni)
009408d24361235c1d85b7d147983cff7b0fc191 ci: Pin jobserver to 0.1.26 to keep MSRV (Daniela Brozzoni)

Pull request description:

  Fixes #1138

  ### Changelog notice

  - rename `TxGraph::direct_conflicts_of_tx` to `TxGraph::direct_conflicts`

  ### 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:
  evanlinjin:
    ACK d5c87c49a82c5cd3a4558e61fe9984f0ae8c6cb7

Tree-SHA512: 10072c65025d5fcc5d90c61ecba1dad53bcd10929326ab18ddadb21322841203aa5861adc9c5f200bbc57b0fe59dd4859dc3672870a0ad343fd8a660fd8aa40e