[web] Update to react-timeago@7.1.0

Summary: This solves ENG-3818.

Test Plan:
Follow the repro steps in the linked Linear issue. After updating the package, the issue no longer occurs

Package changelog appears to show no breaking changes

Reviewers: michal, atul, tomek

Reviewed By: michal

Differential Revision: https://phab.comm.dev/D7681