chore(deps): upgrade `bitcoind` to `0.36.0` and `electrum-client` to `0.20.0`

[oleonardolima]

partially fixes #1422

Description

It updates the bitcoind, and the electrum-client crate dependencies.

The dependencies electrum-client, bitcoind and bitcoin-core-rpc still depends on unreleased versions, that's why it patches the crates.io to unreleased branches instead, it should be updated prior merging this PR.

NOTE: The overall BDK update to 0.32.0 still requires and depends on some other crates, please refer to #1422.

Notes to the reviewers

It's open for any comments.

Changelog notice

• Update the bitcoind crate dependency to 0.36.0
• Update the electrum-client crate dependency to 0.20.0

Checklists

All Submissions:

• [x] I've signed all my commits
• [x] I followed the contribution guidelines
• [x] I ran cargo fmt and cargo clippy before committing

New Features:

• [x] I've added tests for the new feature
• [x] I've added docs for the new feature