unpin scipy since statsmodels was fixed

[Dr-Irv]

In #61750 and #61754 @jorisvandenbossche pinned scipy due to a statsmodels issue. That has apparently been fixed, so this unpins the upper bound on scipy.

[mroeschke]

Thanks @Dr-Irv

[lumberbot-app]

Owee, I'm MrMeeseeks, Look at me.

There seem to be a conflict, please backport manually. Here are approximate instructions:

1. Checkout backport branch and update it.

git checkout 2.3.x
git pull

2. Cherry pick the first parent branch of the this PR on top of the older branch:

git cherry-pick -x -m1 e72c8a1e0ad421c1b8a7b918d995f24bed595cc3

3. You will likely have some merge/cherry-pick conflict here, fix them and commit:

git commit -am 'Backport PR #61933: unpin scipy since statsmodels was fixed'

4. Push to a named branch:

git push YOURFORK 2.3.x:auto-backport-of-pr-61933-on-2.3.x

5. Create a PR against branch 2.3.x, I would have named this PR:

"Backport PR #61933 on branch 2.3.x (unpin scipy since statsmodels was fixed)"

And apply the correct labels and milestones.

Congratulations — you did some good work! Hopefully your backport PR will be tested by the continuous integration and merged soon!

Remember to remove the Still Needs Manual Backport label once the PR gets merged.

If these instructions are inaccurate, feel free to suggest an improvement.

[jorisvandenbossche]

Manual backport -> #61934