Merge bitcoindevkit/bdk#2136: Fix `bdk_esplora` compilation error by bumping `esplora...

1804699d372ade32825e444c9939626b94731596 fix(esplora): Bump `esplora-client` to `0.12.3` (志宇)

Pull request description:

  ### Description

  I didn't realize #2053 didn't actually compile when I merged it. This PR fixes this by bumping `esplora_client` to `0.12.3` so that the `.get_block_infos` method is always available.

  ### Changelog

  ```md
  Fixed:
  - Bump `esplora_client` to `0.12.3` so that the `.get_block_infos` method is always available.
  ```

  ### Checklists

  #### All Submissions:

  * [x] I followed the [contribution guidelines](https://github.com/bitcoindevkit/bdk/blob/master/CONTRIBUTING.md)

ACKs for top commit:
  oleonardolima:
    ACK 1804699d372ade32825e444c9939626b94731596
  luisschwab:
    ACK 1804699d372ade32825e444c9939626b94731596

Tree-SHA512: 1d80cab1173a77286b8946da9c89dce5e86b5d91bca4cb9a6e30b7b0dabcefb6b3ced858c8b235198970a1a7ce368db74ce85735e0a30ae02f95ea3c0c75ef76