Add new DM key 0x3A88669D54BA35B8 (Manuel Traut) (RT #9840)

Action: add
Subject: Manuel Traut
Username: manut
Role: DM
Key: 3DD87FCD3C06A76D0FC83E383A88669D54BA35B8
Key-type: 4096R
RT-Ticket: 9840
Request-signed-by: santiago
Key-certified-by: aferraris, gladk, otto, piotr, roberto
Details: https://nm.debian.org/process/1415/
