releaseWizard.py DeprecationWarning: datetime.datetime.utcnow() is deprecated

[ChrisHegarty]

I get many verbose warnings when running the release wizard, which obfuscate the output. E.g.

/Users/chegar/git/tmp/lucene/./dev-tools/scripts/releaseWizard.py:102: DeprecationWarning: datetime.datetime.utcnow() is deprecated and scheduled for removal in a future version. Use timezone-aware objects to represent datetimes in UTC: datetime.datetime.now(datetime.UTC).
  'epoch': unix_time_millis(datetime.utcnow()),
/Users/chegar/git/tmp/lucene/./dev-tools/scripts/releaseWizard.py:1852: DeprecationWarning: datetime.datetime.utcnow() is deprecated and scheduled for removal in a future version. Use timezone-aware objects to represent datetimes in UTC: datetime.datetime.now(datetime.UTC).
  return datetime.utcnow() + timedelta(hours=73)

[rmuir]

change to datetime.now(tz=UTC)