Bump pip-tools to latest major (7.*)

[gmcrocetti]

Code improvement description

A new major version of pip-tools has been released and introduced backwards incompatible changes. The changelog of the release is available here.

I can work on it but before that hearing from the maintainers is a must as there are important implications with this bump.

[jeffwidman]

We def want it, but it's blocked by these first:

• Drop python 3.6 #7610
• Drop support for Python 3.7 #7677

I'm actually working on those this week, although the deprecation notice won't go out on the blog until later this month, so can't merge until then.

Once I've got the 3.7-drop PR in mergable shape, be great if you want to take a crack at a PR updating pip-tools that's based off the 3.7-drop PR branch.

[gmcrocetti]

I'm actually working on those this week, although the deprecation notice won't go out on the blog until later this month, so can't merge until then.

Oh, alright. It definitely requires wide communication o/.

Once I've got the 3.7-drop PR in mergable shape, be great if you want to take a crack at a PR updating pip-tools that's based off the 3.7-drop PR branch.

Sure thing. Just let me know 💪

[sir-sigurd]

isn't this done in #7711?

[jeffwidman]

Yes it was, thank you @sir-sigurd for pointing that out!