ast.parse doesn't respect feature_version for debug f-strings

[hauntsaninja]

BPO	40614
Nosy	@lysnikolaou, @pablogsal, @hauntsaninja
PRs	bpo-40614: Respect feature version for f-string debug expressions #20196 [3.9] bpo-40614: Respect feature version for f-string debug expressions (GH-20196) #20464 [3.8] bpo-40614: Respect feature version for f-string debug expressions (GH-20196) #20466

^{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 2020-06-06.10:12:56.029>
created_at = <Date 2020-05-13.07:17:35.309>
labels = ['type-bug']
title = "ast.parse doesn't respect feature_version for debug f-strings"
updated_at = <Date 2020-06-06.10:12:56.029>
user = 'https://github.com/hauntsaninja'

bugs.python.org fields:

activity = <Date 2020-06-06.10:12:56.029>
actor = 'lys.nikolaou'
assignee = 'none'
closed = True
closed_date = <Date 2020-06-06.10:12:56.029>
closer = 'lys.nikolaou'
components = []
creation = <Date 2020-05-13.07:17:35.309>
creator = 'hauntsaninja'
dependencies = []
files = []
hgrepos = []
issue_num = 40614
keywords = ['patch']
message_count = 4.0
messages = ['368763', '370129', '370134', '370816']
nosy_count = 3.0
nosy_names = ['lys.nikolaou', 'pablogsal', 'hauntsaninja']
pr_nums = ['20196', '20464', '20466']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue40614'
versions = []

[hauntsaninja]

~master λ python3.8             
Python 3.8.2 (default, Apr 21 2020, 00:39:48) 
[Clang 11.0.0 (clang-1100.0.33.17)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import ast
>>> ast.parse('''f"{x=}"''')  # should work
<_ast.Module object at 0x10f81af40>
>>> ast.parse('''f"{x=}"''', feature_version=(3, 6))  # should fail, but doesn't
<_ast.Module object at 0x10f857d00>

[pablogsal]

New changeset c116c94 by Shantanu in branch 'master':
bpo-40614: Respect feature version for f-string debug expressions (GH-20196)
c116c94

[pablogsal]

New changeset 9b83829 by Pablo Galindo in branch '3.9':
[3.9] bpo-40614: Respect feature version for f-string debug expressions (GH-20196) (GH-20464)
9b83829

[pablogsal]

New changeset f7ed4d4 by Shantanu in branch '3.8':
bpo-40614: Respect feature version for f-string debug expressions (GH-20196) (GH-20466)
f7ed4d4