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packaging/core.py: use UTC time stamps

--HG--
branch : 3.0
6 jobs for topic/3.0/minor in 2 minutes and 26 seconds (queued for 1 second)
Status Name Job ID Coverage
  Test
passed test-coverage #174048

00:01:29

95.0%
passed test-pypy3 #174047

00:02:24

passed test-python36 #174043

00:00:53

passed test-python37 #174044

00:02:22

passed test-python38 #174045

00:00:56

passed test-python39 #174046

00:00:58