http.cookiejar.DefaultCookiePolicy should use current timestamp instead of last updated timestamp value for checking expiry

GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2019-06-12.11:59:44.793>
labels = ['type-bug', 'library', '3.9']
title = 'http.cookiejar.DefaultCookiePolicy should use current timestamp instead of last updated timestamp value for checking expiry'
updated_at = <Date 2019-07-30.14:43:51.805>
user = 'https://github.com/tirkarthi'

bugs.python.org fields:

activity = <Date 2019-07-30.14:43:51.805>
actor = 'nsiregar'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2019-06-12.11:59:44.793>
creator = 'xtreak'
dependencies = []
files = []
hgrepos = []
issue_num = 37246
keywords = ['patch']
message_count = 1.0
messages = ['345327']
nosy_count = 4.0
nosy_names = ['orsenthil', 'martin.panter', 'serhiy.storchaka', 'xtreak']
pr_nums = ['15023']
priority = 'normal'
resolution = None
stage = 'patch review'
status = 'open'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue37246'
versions = ['Python 3.9']