global: release 0.23.0

zstd 1.5.6, new wheels, and some other misc changes.

global: release 0.22.0

Mainly to publish Python 3.12 wheels.

global: release version 0.21.0

Mainly for zstd 1.5.5.

global: update version to 0.20.0

Let's do a release to ship the zstd 1.5.2 -> 1.5.4 upgrade.

global: change release to 0.19.0

Let's do a release.

Main impetus for this is to produce 3.11 wheels. But there's some other
changes worth shipping.

global: change version to 0.18.0

Let's get a release out the door.

global: release version 0.17.0

Let's push out a new release so we publish zstd 1.5.1.

global: update version to 0.16.0 and release

It's been a while and we should get a release out.

Merge branch 'main' into 0.15

We just made main the 0.15.2 release. Let's merge it into the 0.15
branch so that branch is current.

global: release 0.15.1

This contains bug fixes for the 3 issues reported so far. Let's get it out
the door.