Refactor engines that parse ISO 8601 dates with strptime to use
fromisoformat instead. In most cases this is a direct replacement of
strptime(text, "format") with fromisoformat(text).
For engines where the source has a trailing "Z" that strptime consumed
as a literal (e.g. "%Y-%m-%dT%H:%M:%S.%fZ" in huggingface.py), add
rstrip("Z") to keep the output naive and preserve the existing behavior.
In sogou.py the date is extracted with a regular expression, which can
yield strings like "2026-7-11". strptime accepts this via its format
string, but fromisoformat does not. To preserve the existing behavior
and satisfy the format fromisoformat expects, add zero-padding for the
month and day.
Closes: #6098
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Signed-off-by: OneVth <onebrotravel@gmail.com>
The value of `params['api_key']` isn't read anywhere.
Writing directly into the header object solves this quite easily though.
> [Users can authenticate by including their API key either in a request URL by appending `?apikey=<API KEY>`, or by including the `X-API-Key: <API KEY>` header with the request.](https://wallhaven.cc/help/api)
