Update the changelog for sparse strips renderers

[LaurenzV]

I've set the release date for tomorrow.

[LaurenzV]

I'll wait until tomorrow in case someone else wants to take a look. Perhaps #1329 and #1335 will be merged by then, but probably not a big deal if not.

[DJMcNab]

I haven't reviewed the content, just given a first pass and found this issue.

As a small process note, I see that you've not updated the versions in the Cargo.toml files. That is correct, because this is the CHANGELOG update PR, but note that we also shouldn't be updating the version numbers in the CHANGELOG files either, until the actual release PR. That ensures that the changelog file on main accurately reflects the actual released/unreleased state of the commit. We should also probably change the title of this PR.
I'd also like to see a PR to make sure our dependencies are up-to-date before the release.

Remember that we have https://linebender.org/wiki/process/release/ documented. If anything in there is unclear, feel free to reach out to ask!

[LaurenzV]

I reverted the version bump in the changelog, as mentioned in the Zulip, I'm not sure what to do about the dependencies though. Should I just blindly update all of them, even if some aren't used by sparse strips?

[DJMcNab]

LGTM, thanks! I've not done the check to see if there's anything else which should have been included.