Change utcnow to now with time zone

[sanders41]

Pull Request

Related issue

Fixes #753

What does this PR do?

• Changes utcnow() to now() with a utc time zone.

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• Does this PR fix an existing issue, or have you listed the changes applied in the PR description (and why they are needed)?
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[sanders41]

A note on this from some further testing. This is not a true breaking change, but if people have not followed what the doc string says to do it could break. If you send a datetime that does not include the time zone an error is thrown: TypeError: can't compare offset-naive and offset-aware datetimes. The doc string does say to use UTC time so in theory this shouldn't be an issue, but I wanted to point it out in case issues come in later so we will know the solution.

[alallema]

Thanks, @sanders41 for this PR 🔥
LGTM!
Regarding the not true breaking, I think adding a note about it in the Changelog to specify it will be enough, thanks for all these details

[alallema]

bors merge

[meili-bors]

Build succeeded:

• integration-tests (3.10)
• integration-tests (3.11)
• integration-tests (3.7)
• integration-tests (3.8)
• integration-tests (3.9)
• mypy
• pylint