Merge bitcoindevkit/bdk#1389: Bump bdk version to 1.0.0-alpha.8

Merge bitcoindevkit/bdk#1389: Bump bdk version to 1.0.0-alpha.8

7b97c956c7abdd6415ccdda79c26cf212e15cb4e Bump bdk version to 1.0.0-alpha.8 (Steve Myers)

Pull request description:

  ### Description

  Bump versions:

  bdk version to 1.0.0-alpha.8
  bdk_bitcoind_rpc to 0.7.0
  bdk_electrum to 0.10.0
  bdk_esplora to 0.10.0
  bdk_file_store to 0.8.0
  bdk_hwi to 0.2.0

  fixes #1388

  ### 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 7b97c956c7abdd6415ccdda79c26cf212e15cb4e

Tree-SHA512: 32286f33f8fe595f79ef6b9450c7906dee15b5c93ad62435025f4fb1446f9ee8c6147190d628b95e21b8f36c02ca3f8b86b8a5e8cab3835773750967f9e36489