fix(inbox): RFC 2822 dates parsing

[joscha]

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Short description

Wed, 12 Jan 2022 13:08:52 GMT is a valid RFC 2822 date, however pendulum runs into problems with it, due to the GMT only portion:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/Users/joscha/dev/dagster-gmail-extractor/.devenv/state/venv/lib/python3.12/site-packages/pendulum/parser.py", line 36, in parse
    return _parse(text, **options)
           ^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/joscha/dev/dagster-gmail-extractor/.devenv/state/venv/lib/python3.12/site-packages/pendulum/parser.py", line 54, in _parse
    return pendulum.datetime(
           ^^^^^^^^^^^^^^^^^^
  File "/Users/joscha/dev/dagster-gmail-extractor/.devenv/state/venv/lib/python3.12/site-packages/pendulum/__init__.py", line 140, in datetime
    return DateTime.create(
           ^^^^^^^^^^^^^^^^
  File "/Users/joscha/dev/dagster-gmail-extractor/.devenv/state/venv/lib/python3.12/site-packages/pendulum/datetime.py", line 103, in create
    tz = pendulum._safe_timezone(tz)
         ^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/joscha/dev/dagster-gmail-extractor/.devenv/state/venv/lib/python3.12/site-packages/pendulum/__init__.py", line 109, in _safe_timezone
    elif obj.tzname(None) == "UTC":
         ^^^^^^^^^^^^^^^^
  File "/Users/joscha/dev/dagster-gmail-extractor/.devenv/state/venv/lib/python3.12/site-packages/dateutil/tz/tz.py", line 238, in tzname
    return self._tznames[self._isdst(dt)]
                         ^^^^^^^^^^^^^^^
  File "/Users/joscha/dev/dagster-gmail-extractor/.devenv/state/venv/lib/python3.12/site-packages/dateutil/tz/tz.py", line 291, in _isdst
    dstval = self._naive_is_dst(dt)
             ^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/joscha/dev/dagster-gmail-extractor/.devenv/state/venv/lib/python3.12/site-packages/dateutil/tz/tz.py", line 259, in _naive_is_dst
    timestamp = _datetime_to_timestamp(dt)
                ^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/joscha/dev/dagster-gmail-extractor/.devenv/state/venv/lib/python3.12/site-packages/dateutil/tz/tz.py", line 1814, in _datetime_to_timestamp
    return (dt.replace(tzinfo=None) - EPOCH).total_seconds()
            ^^^^^^^^^^
AttributeError: 'NoneType' object has no attribute 'replace'

The fix is to use email.utils.parsedate_to_datetime() to parse RFC 2822-style email date headers. It’s designed for exactly this case. We then upgrade the object to a pendulum instance after.

[rudolfix]

LGTM! thanks!