Merge bitcoindevkit/bdk#2155: chore(release): bump `bdk_chain` to `0.23.3`

d6e0a24d02b5a7e59f46d410477fb99b3b24cc49 chore(release): bump `bdk_chain` to `0.23.3` (Leonardo Lima)
d8ae3cb1fa782f99363b73ef7afe6564f79f2f35 fix(docs): `KeychainTxOutIndex` link used in `bdk_core` (Leonardo Lima)

Pull request description:

  fixes #2070
  addresses #2154

  ### Description

  The PR bump the version for required packages for upcoming release, and update it's `CHANGELOG.md` files:

  - bump `bdk_chain` to `0.23.3` and update it's `CHANGELOG`.
  - bump `bdk_esplora` to `0.22.2` and update it's `CHANGELOG`.
  - bump `bdk_core` to `0.6.3` and update it's `CHANGELOG`.

  ### Checklists

  #### All Submissions:

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

ACKs for top commit:
  oleonardolima:
    self-ACK d6e0a24d02b5a7e59f46d410477fb99b3b24cc49
  notmandatory:
    ACK d6e0a24d02b5a7e59f46d410477fb99b3b24cc49

Tree-SHA512: afdd5a82d465decce410a470c615e0b6e1935a1822f2f91f2720e7c960be18b46242c3b3d35139514191e9d7197bd07b5d7c05208b3e2a6c90e21900b5ab935f