Stop using bootstrap_python for deep-freeze in UNIX builds

BPO	45873
Nosy	@gvanrossum, @tiran
PRs	bpo-45873: Get rid of bootstrap_python #29714 bpo-45873: Get rid of bootstrap_python #29717 bpo-45873: Restore Python 3.6 compatibility (GH-29730) #29730

^{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 2021-11-23.21:51:08.166>
created_at = <Date 2021-11-22.18:51:49.534>
labels = ['build', '3.11']
title = 'Stop using bootstrap_python for deep-freeze in UNIX builds'
updated_at = <Date 2021-11-23.21:51:08.166>
user = 'https://github.com/gvanrossum'

bugs.python.org fields:

activity = <Date 2021-11-23.21:51:08.166>
actor = 'gvanrossum'
assignee = 'none'
closed = True
closed_date = <Date 2021-11-23.21:51:08.166>
closer = 'gvanrossum'
components = ['Build']
creation = <Date 2021-11-22.18:51:49.534>
creator = 'gvanrossum'
dependencies = []
files = []
hgrepos = []
issue_num = 45873
keywords = ['patch']
message_count = 3.0
messages = ['406798', '406857', '406884']
nosy_count = 2.0
nosy_names = ['gvanrossum', 'christian.heimes']
pr_nums = ['29714', '29717', '29730']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue45873'
versions = ['Python 3.11']