test_asyncio: test_call_later() fails on Windows x64 GitHub Action

[vstinner]

BPO	42553
Nosy	@vstinner, @miss-islington
PRs	bpo-42553: Fix test_asyncio.test_call_later() #23627 [3.9] bpo-42553: Fix test_asyncio.test_call_later() (GH-23627) #23628 [3.8] bpo-42553: Fix test_asyncio.test_call_later() (GH-23627) #23629

^{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 2020-12-03.13:28:24.448>
created_at = <Date 2020-12-03.12:30:02.732>
labels = ['3.8', 'tests', '3.9', '3.10']
title = 'test_asyncio: test_call_later() fails on Windows x64 GitHub Action'
updated_at = <Date 2020-12-03.13:28:24.445>
user = 'https://github.com/vstinner'

bugs.python.org fields:

activity = <Date 2020-12-03.13:28:24.445>
actor = 'vstinner'
assignee = 'none'
closed = True
closed_date = <Date 2020-12-03.13:28:24.448>
closer = 'vstinner'
components = ['Tests']
creation = <Date 2020-12-03.12:30:02.732>
creator = 'vstinner'
dependencies = []
files = []
hgrepos = []
issue_num = 42553
keywords = ['patch']
message_count = 4.0
messages = ['382404', '382406', '382410', '382413']
nosy_count = 2.0
nosy_names = ['vstinner', 'miss-islington']
pr_nums = ['23627', '23628', '23629']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue42553'
versions = ['Python 3.8', 'Python 3.9', 'Python 3.10']

[vstinner]

FAIL: test_call_later (test.test_asyncio.test_events.SelectEventLoopTests)
----------------------------------------------------------------------

Traceback (most recent call last):
  File "D:\a\cpython\cpython\lib\test\test_asyncio\test_events.py", line 301, in test_call_later
    self.assertTrue(0.08 <= t1-t0 <= 0.8, t1-t0)
AssertionError: False is not true : 0.07799999999997453

https://github.com/python/cpython/pull/23626/checks?check_run_id=1492411421

[vstinner]

New changeset 7e5e13d by Victor Stinner in branch 'master':
bpo-42553: Fix test_asyncio.test_call_later() (GH-23627)
7e5e13d

[miss-islington]

New changeset 930d537 by Miss Islington (bot) in branch '3.8':
bpo-42553: Fix test_asyncio.test_call_later() (GH-23627)
930d537

[miss-islington]

New changeset 9f26833 by Miss Islington (bot) in branch '3.9':
bpo-42553: Fix test_asyncio.test_call_later() (GH-23627)
9f26833