Release 0.4.2 with updated dependencies

[link2xt]

deltachat-core-rust is currently stuck with 0.4.x branch to keep it compatible with already released versions on the protocol level.

However, 0.4.1 still uses old quinn version which does not contain necessary Android fixes. quinn has been updated on iroh 0.5.x branch and later, but there is no 0.4.x release with updated quinn we can use so deltachat-core-rust currently relies on a [patch.crates-io] which is not reliable. We have an issue open for a long time because it was expected that update of iroh would be easy: chatmail/core#4318

To close the issue and get rid of patch section, I have forked iroh 0.4.1 and updated dependencies by backporting minimal changes from the current iroh: v0.4.1...deltachat:iroh:0.4-update-quic
I then created a PR updating to my fork: chatmail/core#4881

Would be nice if you fork a branch off iroh 0.4.1, apply these changes and release iroh 0.4.2 with updated dependencies on crates.io, then I will be able to archive the fork and use crates.io version in deltachat-core-rust.

[link2xt]

Closing in favor of #1849