Htmldate

- fix regression for fast extraction introduced in e8b3538 (96)
- fix setup by making backports-datetime-fromisoformat optional (95)

- slightly higher accuracy with revised heuristics
- simplified code structure for better performance
- setup: support for 3.12, fromisoformat backport if applicable
- HTML parsing fixes: more lenient parsing, pinned LXML version for MacOS

- maintenance release: upgrade `urllib3` dependency

- support min_date/max_date as datetimes or datetime strings with kernc (73)
- add date attributes to HTML extraction with kernc (74)
- fix for extraction of updated and original dates in time elements
- code refactoring and maintenance

- better coverage of relevant HTML attributes
- automatically define upper time bound at each function call (70)
- reviewed and simplified extraction code
- cache validation for format diverging from `%Y-%m-%d`
- updated dependencies and removed real-world tests from package

- additional search of free text in whole document (67)
- optional parameter for subdaily precision with getorca (66)
- fix for HTML doctype parsing (44)
- cleaner code for multilingual month expressions
- extended expressions for extraction in HTML meta fields
- update of dependencies and evaluation