Update libffi to 3.4.2

[zooba]

BPO	45022
Nosy	@pfmoore, @tjguk, @ned-deily, @ambv, @zware, @zooba, @pablogsal, @miss-islington, @Ghostkeeper
PRs	bpo-45022: Pin current libffi build to fixed version in preparation for upcoming update #27982 [3.10] bpo-45022: Pin current libffi build to fixed version in preparation for upcoming update (GH-27982) #27984 [3.9] bpo-45022: Pin current libffi build to fixed version in preparation for upcoming update (GH-27982) #27985 [3.8] bpo-45022: Pin current libffi build to fixed version in preparation for upcoming update (GH-27982) #28001 bpo-45022: Update libffi to 3.4.2 in Windows build #28146

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2021-09-09.21:03:07.969>
created_at = <Date 2021-08-26.21:13:17.382>
labels = ['type-bug', '3.9', '3.10', '3.11', 'ctypes', 'build', 'OS-windows']
title = 'Update libffi to 3.4.2'
updated_at = <Date 2021-09-13.14:45:40.034>
user = 'https://github.com/zooba'

bugs.python.org fields:

activity = <Date 2021-09-13.14:45:40.034>
actor = 'zach.ware'
assignee = 'none'
closed = True
closed_date = <Date 2021-09-09.21:03:07.969>
closer = 'steve.dower'
components = ['Build', 'Windows', 'ctypes']
creation = <Date 2021-08-26.21:13:17.382>
creator = 'steve.dower'
dependencies = []
files = []
hgrepos = []
issue_num = 45022
keywords = ['patch']
message_count = 13.0
messages = ['400382', '400383', '400385', '400430', '400431', '400432', '401004', '401012', '401013', '401330', '401518', '401696', '401704']
nosy_count = 9.0
nosy_names = ['paul.moore', 'tim.golden', 'ned.deily', 'lukasz.langa', 'zach.ware', 'steve.dower', 'pablogsal', 'miss-islington', 'Ghostkeeper']
pr_nums = ['27982', '27984', '27985', '28001', '28146']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue45022'
versions = ['Python 3.9', 'Python 3.10', 'Python 3.11']

[zooba]

libffi is doing releases again! We're a few versions behind, so should pull in the latest. https://github.com/libffi/libffi/

Adding RMs for opinions on backporting, and Ned in case this impacts the macOS build.