Sort shamir certificates in get certificates output.

server/parsec/components/memory/user.py

@@ -570,7 +570,7 @@ async def get_certificates(
 
         shamir_recovery_certificates: list[bytes] = []
 
-        for user_id, shamir in org.shamir_setup.items():
+        for user_id, shamir in sorted(org.shamir_setup.items(), key=lambda x: x[1].brief.timestamp):
             # filter on timestamp
             if shamir_recovery_after is not None and shamir.brief.timestamp < shamir_recovery_after:
                 continue