Maintenance release of 0.23

[HeroicKatora]

We want people to transition but not ignoring the history of version bump downstream, we can't expect this. Thus we should port fixes to the previous version. Branch will be based on the prior release.

+1 on another 0.23.x release. Looks like there's been a bunch of additions since the last release; in particular I'd love to see https://github.com/image-rs/image/pull/1624 supported in a version on crates.io (https://github.com/jaredforth/webp/issues/7#issuecomment-987693204 for context).

Originally posted by @antonok-edm in https://github.com/image-rs/image/issues/1433#issuecomment-1010358390

List of PRs to (potentially) port:

• [x] #1485
• [x] #1493
• [ ] #1500
• [ ] #1502
• [x] #1510
• [ ] #1563
• [ ] #1619
• [ ] #1640
• [x] #1649