[lib] Increase join thread timeout
Summary:
Make it consistent with other request that can take longer.
https://linear.app/comm/issue/ENG-8958/invite-invalid-when-trying-to-join-the-comm-community
Test Plan: Check if joining a community through an invite link works on web.
Reviewers: kamil, inka
Reviewed By: inka
Subscribers: ashoat
Differential Revision: https://phab.comm.dev/D12999