Migrate to CUID2

[wgordon17]

CUID has been marked as deprecated and insecure: https://github.com/paralleldrive/cuid

They recommend migrating to CUID2: https://github.com/paralleldrive/cuid2

There is a CUID2 python port available here: https://github.com/overflowdigital/cuid2.py

[wgordon17]

Heh, guess I should've read the README a bit better

It can utilise cuid, ksuid, ulid or any other string-based UID generation systems.

So this is just a fix for the README table to point to the CUID2 python port 😉

[djm]

@wgordon17 Nice, I appreciate the heads-up on this as that seems to be a relatively new revelation (21 days ago). We'll update the README shortly.

For us, thankfully we use them only as identifiers and are not using them in any kind of secure context (such as token based password reset, etc).