subprocess.Popen should not emit a ResourceWarning for a detached process

GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2019-11-22.00:04:09.952>
labels = ['type-bug', '3.8', '3.9', '3.10', 'library', 'OS-windows']
title = 'subprocess.Popen should not emit a ResourceWarning for a detached process'
updated_at = <Date 2021-03-20.23:05:48.367>
user = 'https://github.com/ShaneHarvey'

bugs.python.org fields:

activity = <Date 2021-03-20.23:05:48.367>
actor = 'gregory.p.smith'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)', 'Windows']
creation = <Date 2019-11-22.00:04:09.952>
creator = 'ShaneHarvey'
dependencies = []
files = ['48738']
hgrepos = []
issue_num = 38890
keywords = []
message_count = 6.0
messages = ['357237', '357451', '357455', '357458', '388906', '389196']
nosy_count = 8.0
nosy_names = ['gregory.p.smith', 'paul.moore', 'tim.golden', 'zach.ware', 'eryksun', 'steve.dower', 'behackett', 'ShaneHarvey']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue38890'
versions = ['Python 3.8', 'Python 3.9', 'Python 3.10']