fix: await unawaited calendar.events.patch call in updateEvent

[ThyMinimalDev]

What does this PR do?

Fixes an unhandled promise rejection in the Google Calendar service that could crash the API when hitting Google Calendar quota limits.

In the updateEvent method, the calendar.events.patch call (used to update the event description with the hangout link) was not awaited. This meant if the patch request failed (e.g., due to quota exceeded errors), the promise rejection would occur after the function returned, bypassing the try/catch block and causing an unhandled rejection.

Error that was occurring:

unhandledRejection: Quota exceeded for quota metric 'Queries' and limit 'Queries per minute' of service 'calendar-json.googleapis.com'

Mandatory Tasks (DO NOT REMOVE)

• I have self-reviewed the code (A decent size PR without self-review might be rejected).
• I have updated the developer docs in /docs if this PR makes changes that would require a documentation change. N/A - no documentation changes needed.
• I confirm automated tests are in place that prove my fix is effective or that my feature works. N/A - existing error handling tests cover this; the fix ensures errors are now caught by the existing try/catch.

How should this be tested?

1. The fix ensures that any errors from the calendar.events.patch call are now properly caught by the surrounding try/catch block
2. To reproduce the original issue, you would need to hit Google Calendar API quota limits during an event update with a Google Meet link
3. With this fix, quota errors will be caught and logged rather than causing an unhandled rejection

Human Review Checklist

• Verify the existing try/catch block (line 434-440) will properly catch errors from the now-awaited patch call
• Consider if waiting for the patch has any unintended side effects (it shouldn't - this is the correct behavior)

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Link to Devin run: https://app.devin.ai/sessions/3bae43ad0f0a4680899fe9b4e0908aec
Requested by: @ThyMinimalDev

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[emrysal]

Yep, let's merge 👍

[cubic-dev-ai]

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