fix(study-rooms): specify and serve UCI timezone for slots

[laggycomputer]

Description

Followup to #75, fixing study room slot times being rendered in Postgres's local timezone.
We simply set the timezone on the connection acquired by the scraper to America/Los_Angeles.

Related Issue

Resolves #84. We both specify the intended behavior from #75 in the example and actually fulfill it.

Motivation and Context

How Has This Been Tested?

Tested by setting Postgres's timezone to America/New_York, running the scraper, then testing the API request.

Screenshots (if appropriate):

Despite forcing Postgres's global timezone to change, the timezone is correct since we set it on the session which takes precedence over the global setting:

We know this is effective because setting a different timezone for the scraper's SQL session uses that timezone instead:

So if we force America/Los_Angeles on the scraper session, it will give the correct offset regardless of Postgres or system timezone.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code involves a change to the database schema.
• My code requires a change to the documentation.

[andrew-wang0]

LGTM 🫡