Takashi Kajinami 47b10ce560 Remove implicit dependency on iso8601
iso8601.iso8601.UTC has been equivalent to datetime.timezone.utc in
Python 3. Because python 2 is no longer supported, we can directly use
the built-in implementation.

Change-Id: Ic3b07a6b39769e72cf966eac9e7fa0f9eeadf48e
2025-03-11 15:19:45 +00:00
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