Make aware_datetimes() generate only ISO8601-encodable datetimes.

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commit 091498e3c77ac098ea703650fde83c54b6aab5d5
Author: Valentin Lorentz <vlorentz@softwareheritage.org>
Date:   Tue May 5 12:03:39 2020 +0200

    Make aware_datetimes() generate only ISO8601-encodable datetimes.

See https://jenkins.softwareheritage.org/job/DMOD/job/tests-on-diff/53/ for more details.

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