upgrade werkzeug and connexion from version 2 to 3

[burnettk]

there is a snyk failure:

Upgrade [email protected] to [email protected] to fix
  ✗ Inefficient Algorithmic Complexity (new) [Medium Severity][https://security.snyk.io/vuln/SNYK-PYTHON-WERKZEUG-6035177] in [email protected]
    introduced by [email protected] and [18](https://github.com/sartography/spiff-arena/actions/runs/6655795109/job/18086859698?pr=590#step:4:19) other path(s)

because it wants a connexion upgrade, and we can't easily upgrade it because connexion it is using the old flask json API. connexion (which is also on major version 2 in backend) has a version 3 alpha release:

https://pypi.org/project/connexion/#history

but this version 3 alpha release, even if we wanted to upgrade, is also not a drop-in replacement for version 2. we have marked the snyk issue until we can resolve this github issue.

hoping to defer this for as long as possible to see if the connexion library version 3 release comes out of its alpha state, and then we can more confidently do the work required to get compatible with that new release.