ProcessPoolExecutor(max_workers=64) crashes on Windows

BPO	26903
PRs	bpo-26903: Limit ProcessPoolExecutor to 61 workers on Windows #13132 [3.7] bpo-26903: Limit ProcessPoolExecutor to 61 workers on Windows (GH-13132) #13206 [3.7] bpo-26903: Limit ProcessPoolExecutor to 61 workers on Windows (GH-13132) #13643

^{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/brianquinlan'
closed_at = <Date 2019-05-09.17:37:35.091>
created_at = <Date 2016-05-01.20:45:38.281>
labels = ['type-bug', 'build']
title = 'ProcessPoolExecutor(max_workers=64) crashes on Windows'
updated_at = <Date 2021-11-04.13:56:41.517>
user = 'https://github.com/diogocp'

bugs.python.org fields:

activity = <Date 2021-11-04.13:56:41.517>
actor = 'eryksun'
assignee = 'bquinlan'
closed = True
closed_date = <Date 2019-05-09.17:37:35.091>
closer = 'bquinlan'
components = ['Cross-Build']
creation = <Date 2016-05-01.20:45:38.281>
creator = 'diogocp'
dependencies = []
files = []
hgrepos = []
issue_num = 26903
keywords = ['patch']
message_count = 12.0
messages = ['264608', '265007', '265086', '265206', '340390', '341545', '341571', '341918', '343858', '365886', '365901', '366314']
nosy_count = 0.0
nosy_names = []
pr_nums = ['13132', '13206', '13643']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue26903'
versions = ['Python 3.6']