don't set inviterEmail / inviterName if the inviter is the superuser:
- return fromSuperuser true/false
- if fromSuperuser, don't set inviterEmail / inviterName
- tests: add tests for non-superuser admin invites
* updates pydantic to 2.x
* also update to python 3.12
* additional type fixes:
- all Optional[] types must have a default value
- update to constrained types
- URL types converted from str
- test updates
Fixes#1940