Added my fingerprint Stephan Oeste (Emzy)

By request from added my PGP fingerprint.
See: bitcoin-core/gitian.sigs#1220 (comment)

Author: Emzy

contrib/gitian-keys/keys.txt

@@ -29,6 +29,7 @@ D762373D24904A3E42F33B08B9A408E71DAAC974 Pieter Wuille (Location: Leuven, Belgiu
 133EAC179436F14A5CF1B794860FEB804E669320 Pieter Wuille
 A8FC55F3B04BA3146F3492E79303B33A305224CB Sebastian Kung (TheCharlatan)
 ED9BDF7AD6A55E232E84524257FF9BDBCC301009 Sjors Provoost
+9EDAFF80E080659604F4A76B2EBB056FD847F8A7 Stephan Oeste (Emzy)
 AEC1884398647C47413C1C3FB1179EB7347DC10D Warren Togami
 79D00BAC68B56D422F945A8F8E3A8F3247DBCBBF Willy Ko
 71A3B16735405025D447E8F274810B012346C9A6 Wladimir J. van der Laan