Increase lambda timeout to 10 seconds

[MinhxNguyen7]

Summary

• We were having some timeouts on save, possibly because our DB queries were taking longer than the previous five-second limit.
• Manually increasing the limit on the current deployment fixed the issue.
• The problem might be that, with auto-save, we send multiple requests that have to written and overwritten sequentially, and the "queue time" can exceed five seconds.

Future Follow-Up

• Have a timer so we don't auto-save every action.
• Somehow cancel the previous update to a schedule if a new one comes in. Not sure how this is possible.

[ecxyzzy]

LGTM, we really gotta fix the test erroring at some point...