add support for os.PathLike filename in zipfile.ZipFile.write()

GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2020-05-05.02:12:03.387>
labels = ['type-feature', 'library', '3.10']
title = 'add support for os.Pathlike filenames in zipfile.ZipFile.writestr'
updated_at = <Date 2021-09-08.00:49:22.380>
user = 'https://github.com/domragusa'

bugs.python.org fields:

activity = <Date 2021-09-08.00:49:22.380>
actor = 'ethan.furman'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2020-05-05.02:12:03.387>
creator = 'd.ragusa'
dependencies = []
files = ['49132']
hgrepos = []
issue_num = 40506
keywords = ['patch']
message_count = 2.0
messages = ['368098', '368289']
nosy_count = 4.0
nosy_names = ['twouters', 'ethan.furman', 'serhiy.storchaka', 'd.ragusa']
pr_nums = ['20002']
priority = 'normal'
resolution = None
stage = 'patch review'
status = 'open'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue40506'
versions = ['Python 3.10']