Release 0.26.0

[hoodmane]

It's about time to release v0.26.0. I'd like to include memory snapshots, I think the bindings #4699 can wait.
@ryanking13 anything you want to get in?

• enable xgboost

[ryanking13]

Sounds good. I need to enable xgboost before the release. I have no other thing I want to include.

include memory snapshots

Is it stable enough to be added? Or do we want to add it privately without making a public API?

[hoodmane]

I would like to add it as public but marked experimental.

[ryanking13]

I would like to add it as public but marked experimental.

Sounds good!

[hoodmane]

I think we can go ahead and release with what we have. I guess we should draw up some release notes.

[ryanking13]

Good! Let's make a release before PyCon, if possible.

[hoodmane]

Two problems:

1. docs didn't deploy
2. Update cross-build metadata file failed

I can fix docs.

[agriyakhetarpal]

For (2), I checked and both the workflow and the tools/update_cross_build_releases.py seem okay to me, it worked locally with an environment variable. So the only reasonable explanation is that the environment variable did not percolate to the steps after it.

[agriyakhetarpal]

Found the error: it should have been

echo "VERSION=${{ github.event.inputs.version }}" >> $GITHUB_ENV

i.e., missing an extra > character

[agriyakhetarpal]

Never mind – #4808 fixed it already (edit: okay, it did not)

[hoodmane]

Okay I fixed the docs.

[ryanking13]

Thanks for finishing the release!

Update cross-build metadata file failed

I'll update the metadata file manually. It is not yet used, so it is not an big issue.