deps: set numpy>=1.14.0

[tobias-urdin]

The copy kwarg on astype() was not introduced until 1.14.0 and we are using that in multiple places.

[tobias-urdin]

@Mergifyio rebase

[mergify]

⚠️ This pull request got rebased on behalf of a random user of the organization.
This behavior will change on the 1st February 2023, Mergify will pick the author of the pull request instead.

To get the future behavior now, you can configure bot_account options (e.g.: bot_account: { author } or update_bot_account: { author }.

Or you can create a dedicated github account for squash and rebase operations, and use it in different bot_account options.

[mergify]

rebase

✅ Branch has been successfully rebased

[tobias-urdin]

I will enforce this in master so for next version but not backport to stable/4.4 even though using a version older than 1.14.0 in 4.4 would not work.