set last_login on login

[mekarpeles]

Closes #8179

In ~2016 or 2017 when we switched from Open Library authentication to archive.org auth via the xauthn bridge, we somehow dropped a codepath which set/updated the last_login value on the patron's Open Library account. This adds back a last_login set in the audit authentication path.

Technical

Testing

Minimal test:

import web
import infogami
from openlibrary.config import load_config
load_config('/olsystem/etc/openlibrary.yml')
infogami._setup()
from infogami import config;
a = OpenLibraryAccount.get(email='michael.karpeles@gmail.com')
a['last_login'] = '2023-08-17T08:22:28.788221'  # for example
a._save()

Screenshot

Stakeholders

@jimchamp

[jimchamp]

This is causing errors and preventing me from logging in.