Merge pull request #1389 from lightning-signer/2022-03-bitcoin

Update bitcoin crate to 0.28.1

diff --cc lightning-net-tokio/src/lib.rs
Simple merge

diff --cc lightning/src/ln/channel.rs
Simple merge

diff --cc lightning/src/ln/functional_tests.rs
Simple merge

diff --cc lightning/src/ln/peer_handler.rs
Simple merge

diff --cc lightning/src/routing/scoring.rs
Simple merge

diff --cc lightning/src/util/test_utils.rs
Simple merge