Update CODEOWNERS
Let's give the magic powers to Sid. He is a long-time "old-timer" - surprising that he's not on this list here.
# This file controls who is tagged for review for any given pull request.
# For anything not explicitly taken by someone else:
-* @kindbe @maxgolov @mkoscumb @reyang @bliptec @larvacea @lalitb
+* @kindbe @maxgolov @mkoscumb @reyang @bliptec @larvacea @lalitb @sid-dahiya
