* Create rule S6903
* Create rule S6903: Using timezone aware "datetime"s should be preferred over using "datetime.datetime.utcnow" and "datetime.datetime.utcfromtimestamp"
* Fix after review
* Minor updates
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Co-authored-by: joke1196 <joke1196@users.noreply.github.com>
Co-authored-by: David Kunzmann <david.kunzmann@sonarsource.com>
Co-authored-by: Guillaume Dequenne <guillaume.dequenne@sonarsource.com>