packages: build binary pkgs with Python 3.9

[skshetry]

No description provided.

[skshetry]

Package builds running at https://github.com/iterative/dvc/actions/runs/1489796368.

[efiop]

@skshetry Did 3.9.8 get a rerelease? #6975

[skshetry]

@skshetry Did 3.9.8 get a rerelease? #6975

yeah, there is a 3.9.9 release: https://www.python.org/downloads/release/python-399.

[skshetry]

Looks like setup-python is still using 3.9.8.

[pared]

So we probably need to wait for them now?

[skshetry]

So we probably need to wait for them now?

From https://github.com/actions/virtual-environments:

Regular Weekly Rhythm can be followed by watching Releases. Pre-release is created when deployment is started. As soon as deployment is finished, it is converted to release. You can also track upcoming changes using the awaiting-deployment label.

I already see pre-releases with Python 3.9.9, so we need to wait till they turn to release. Also see actions/runner-images#4521.

[pared]

Seems like the new 3.9 is on now.