web.py release v0.70 (#775)

* web.py release v0.70

* Ruff: set upper limits on code complexity

* pre-commit autoupdate

* pre-commit autoupdate

0.40

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Fixed the issue of len not working with the result of db query. (#554)

* Fixed the issue of len not working with the result of db query.

The earlier implentation was adding an __len__ function to the result
object and that worked fine for old-style classes. With old-style
classes gone in Python 3, that started giving trouble. Fixed it by
writing a ResultSet class and a special SqliteResultSet which doesn't
support len, but supports bool.

Fixes #547.

* cleanup of db tests.