update olposthog

[ChristopherChudzicki]

What are the relevant tickets?

Related to #3356

Description (What does it do?)

Updates ol-posthog to include

• Allow local evaluation of posthog + limit performance impact during outages ol-django#408

How can this be tested?

1. Rebuild web container
2. Ensure you have POSTHOG_ENABLED=true and POSTHOG_PROJECT_API_KEY. If you want, you can use mine (see script below)
3. Define some flag in your personal posthog account and

# POSTHOG_ENABLED=True
# (This is not a secret)
# POSTHOG_PROJECT_API_KEY=phc_k26arhw0Wafe79ZDBTqeN3v4Y7dzNS7os9naQPxJhr5
from mitol.olposthog.features import is_enabled

is_enabled('test-flag') # True 
is_enabled('non-existant-flag') # False 
# User-dependent example
is_enabled('redirect-to-learn-dashboard', 'some-user-id-or-just-this-string') # False 
is_enabled('redirect-to-learn-dashboard', None, '3055af80-6c17-4e98-a19c-af5314
   ...: 564275') # True 

[github-actions]

OpenAPI Changes

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[ChristopherChudzicki]

• Allow local evaluation of posthog + limit performance impact during outages ol-django#408

included some new settings, all of which have defaults. So this gets them automatically.

If we prefer to be more explicit, I can restore the settings below and add the new ones.

All the settings here and in the defaults are the same. (POSTHOG_API_HOST is a slight exception. mitxonline defauls to '' which instantiates the client with None; olposthog defaults to the https://us.posthog.com, but these are equivalent as far as the client is concerned, and we override it in rc/prod anyway.)