[Auto] Updated Upstream (CraftBukkit)

Upstream has released updates that appears to apply and compile correctly.
This update has not been tested by PaperMC and as with ANY update, please do your own testing

CraftBukkit Changes:
6fd677caf SPIGOT-6206: Use correct sender UUID for chat messages
a489dd4ac Revert "Downgrade NMS revision"

work/CraftBukkit

@@ -1 +1 @@
-Subproject commit ce64c84ca8c959a290a80a7d59b69809dad8206a
+Subproject commit 6fd677caf2dfa6212b11122e9b41b584e1ef314c