build(deps): bump bitcoin from 0.32.3 to 0.32.4

Bumps [bitcoin](https://github.com/rust-bitcoin/rust-bitcoin) from 0.32.3 to 0.32.4.
- [Release notes](https://github.com/rust-bitcoin/rust-bitcoin/releases)
- [Changelog](https://github.com/rust-bitcoin/rust-bitcoin/blob/master/CHANGELOG.md)
- [Commits](rust-bitcoin/rust-bitcoin@bitcoin-0.32.3...bitcoin-0.32.4)

---
updated-dependencies:
- dependency-name: bitcoin
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>