Update rocket.chat

Changes:

- https://github.com/RocketChat/Docker.Official.Image/commit/eb18c05: Update to 1.2.3

library/rocket.chat

@@ -1,5 +1,5 @@
 Maintainers: Rocket.Chat Image Team <[email protected]> (@RocketChat)
 GitRepo: https://github.com/RocketChat/Docker.Official.Image.git
 
-Tags: 1.2.1, 1.2, 1, latest
-GitCommit: 8501d842cf576ad54a237aa557f48ebce5d67866
+Tags: 1.2.3, 1.2, 1, latest
+GitCommit: eb18c05168c9772775cdfa8eb296562004eb4c4b