[BUG]: Inconsistent case in annotations of python collections

[sizmailov]

Required prerequisites

• Make sure you've read the documentation. Your issue may be addressed there.
• Search the issue tracker and Discussions to verify that this hasn't already been reported. +1 or comment there if it has.
• Consider asking first in the Gitter chat room or in a Discussion.

What version (or hash if on master) of pybind11 are you using?

master

Problem description

Just realized the final version of #4259 was merged with annotations in lowercase, e.g. list, not List. The other parts of the pybind11 produce upper-case annotations for the same python type, but with different C++ counterpart, e.g. std::pair/std::tuple, std::array.

PEP 585 allows to replace the following types for Python-3.7+:

tuple # typing.Tuple
list # typing.List
dict # typing.Dict
set # typing.Set
frozenset # typing.FrozenSet
type # typing.Type

Reproducible example code

 m.def("mix", [](const std::array<int, 3> &, const py::typing::List<int>&) {});

print(demo.mix.__doc__)
# mix(arg0: Annotated[List[int], FixedSize(3)], arg1: list[int]) -> None
# ^^^^ ^^^^

Is this a regression? Put the last known working version here if it is.

Not a regression