[requests] Change urllib3 dependency

[srittau]

As of requests 2.30, the urllib3 dependency is pinned to >=1.21.1,<3, so it works with urllib3 v2, which ships its own type stubs. We should change the dependency from types-urllib3 to urllib3>=2,<3.

[AlexWaygood]

Yup. The reason why that's difficult is that we don't test stubs in isolation when running pyright in CI. It's the same issue I hit in #10090 (comment), and the same issue that @sobolevn hit in #9989 (comment)

[AlexWaygood]

Can't be done until we do #6898.