Update repo owners (#1254)

Author: robga

.github/CODEOWNERS

@@ -5,10 +5,10 @@
 # These owners will be the default owners for everything in
 # the repo. Unless a later match takes precedence,
 # below owners will be requested for review when someone opens a pull request.
-*       @pilor @robga @cemheren @gokmen-msft @calecarter
+*    @robga @cemheren @gokmen-msft @calecarter @varshaj-github
 
 # Order is important; the last matching pattern takes the most
 # precedence. When someone opens a pull request that only
 # modifies files in built-in-references folder, only below owners and not the global
 # owner(s) will be requested for a review.
-/built-in-references/    @varunkumta @sw47 @Amirzadehm
+/built-in-references/    @varunkumta @sw47 @Amirzadehm @anlandu @nreisch