New SSH key for amj (thinbiam)

Summary: Fixes T1036.

Test Plan:
As amj still has access on Ysul, identity has been checked
created there a challenge file. The challange file has been
successfully created by the username "amj", that's satisfactory
as an identity proof.

Reviewers: dereckson

Subscribers: amj

Maniphest Tasks: T1036

Differential Revision: https://devcentral.nasqueron.org/D689