Merge bitcoindevkit/bdk#1972: ci: pin `tracing-core` to `0.1.33` for msrv

7c8b4db50987bd6f17df4ac60fb513cdc33c5e2f ci: pin `tracing-core` to `0.1.33` (Wei Chen)

Pull request description:

  ### Description

  Pin `tracing-core` to `0.1.33` for msrv.

  ### Changelog notice

  * Pin `tracing-core` to `0.1.33`.

  ### 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 +nightly fmt` and `cargo clippy` before committing

ACKs for top commit:
  ValuedMammal:
    ACK 7c8b4db50987bd6f17df4ac60fb513cdc33c5e2f
  oleonardolima:
    ACK 7c8b4db50987bd6f17df4ac60fb513cdc33c5e2f

Tree-SHA512: 2bbca7a6506a3a083cc3a13aa0221dd5d5442c7435bf57f5bfe01d48365b1eab355caf9cb27ee7c57f4adc4d3aa621f6f3ec9379f4b03d5d9a5f9e2284d64785