[zipimport] Update zipimport to use specs

[brettcannon]

BPO	42131
Nosy	@Yhg1s, @brettcannon
PRs	#23187

^{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 = 'https://github.com/brettcannon'
closed_at = <Date 2020-11-16.23:01:09.824>
created_at = <Date 2020-10-23.22:05:33.523>
labels = ['type-bug', 'library', '3.10']
title = '[zipimport] Update zipimport to use specs'
updated_at = <Date 2020-11-16.23:01:09.823>
user = 'https://github.com/brettcannon'

bugs.python.org fields:

activity = <Date 2020-11-16.23:01:09.823>
actor = 'brett.cannon'
assignee = 'brett.cannon'
closed = True
closed_date = <Date 2020-11-16.23:01:09.824>
closer = 'brett.cannon'
components = ['Library (Lib)']
creation = <Date 2020-10-23.22:05:33.523>
creator = 'brett.cannon'
dependencies = []
files = []
hgrepos = []
issue_num = 42131
keywords = ['patch']
message_count = 2.0
messages = ['379481', '380940']
nosy_count = 2.0
nosy_names = ['twouters', 'brett.cannon']
pr_nums = ['23187']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue42131'
versions = ['Python 3.10']

[brettcannon]

zipimport only supports old PEP-302 APIs and not PEP-451 module specs (i.e. it uses load_module() instead of create_module()/exec_module(), find_mdoule() instead of find_spec()).

Uses of both load_module() and find_module() are documented as deprecated for the import system and are slated to eventually go away.

[brettcannon]

New changeset d2e94bb by Brett Cannon in branch 'master':
bpo-42131: Add PEP-451-related methods to zipimport (GH-23187)
d2e94bb