Arti 2.4.0 released: Relay and directory authority development; flowctl-cc stable

Arti is our ongoing project to create a next-generation Tor implementation in Rust. We're happy to announce the latest release, Arti 2.4.0.

This release continues our ongoing development towards using Arti as a relay and as a directory authority. It also contains fixes for a number of bugs affecting onion service client connectivity.

Additionally, as of this release, flow control and congestion control is considered stable, and can be enabled by compiling Arti with the flowctl-cc feature.

Users of the arti-client crate should note that there are multiple breaking changes to the TorClient APIs, and that the use_obsolete_software option has been removed (see #1960).

As usual, this release also contains a number of bugfixes, cleanups, and improvements to our CI infrastructure.

For full details on what we've done, including API changes, and for information about many more minor and less-visible changes, please see the CHANGELOG.

For more information on using Arti, see our top-level README, and the documentation for the arti binary.

Thanks to everybody who's contributed to this release, including Aaron Dewes, Andrew Kloet, Boris Nagaev, Neel Chauhan, Nihal, syphyr.

Also, our deep thanks to our sponsors for funding the development of Arti!