Update transitive dependencies of environs

[StevenMaude]

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[StevenMaude]

As mentioned in this update of environs, environs is used only in opencodelists/settings.py.

I tested this locally: environment variables do get loaded.

[evansd]

FWIW, we opted not to use this Airlock specifically because its transitive dependencies seemed pretty heavyweight for the value it gave. Not saying you shouldn't use it, but worth bearing in mind if you're in the process of reconsidering this stuff.
https://bennettoxford.slack.com/archives/C069YDR4NCA/p1723201362723169

[StevenMaude]

its transitive dependencies seemed pretty heavyweight for the value it gave

Agree that this is a good candidate for removal, here and in job-server.

(And I similarly looked at the dependency subtree with some questioning 🤨🔍)

I don't think it blocks merging this PR in the meantime so we can keep things up-to-date, in the current state, ahead of getting round to #2222.