Merge bitcoindevkit/bdk#1404: Bump bdk version to 1.0.0-alpha.9

5f238d8e672047ac2766550aa3ed97e05e7b2531 Bump bdk version to 1.0.0-alpha.9 (Steve Myers)

Pull request description:

  ### Description

  Bump bdk version to 1.0.0-alpha.9

  bdk_chain to 0.12.0
  bdk_bitcoind_rpc to 0.8.0
  bdk_electrum to 0.11.0
  bdk_esplora to 0.11.0
  bdk_file_store to 0.9.0
  bdk_testenv to 0.2.0

  fixes #1399

  ### Notes to the reviewers

  I also removed unneeded version for bdk_testenv in dev-dependencies, see https://github.com/bitcoindevkit/bdk/pull/1177#discussion_r1545945973.

  ### 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 5f238d8e672047ac2766550aa3ed97e05e7b2531

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