Htmldate

- fix for MacOS: pin LXML dependency with adamh-oai

- focus on precision, stricter extraction patterns (103, 105, 106, 112)
- simplified code base (108, 109)
- replaced lxml.html.Cleaner (104)
- extended evaluation

- fix for missing months keys in custom extractor (100)
- fix for None in `try_date_expr()` (101)

- 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