Remove @c24t and @reyang from CODEOWNERS (census-instrumentation#978)

Author: lzchen

.github/CODEOWNERS

@@ -2,4 +2,4 @@
 # This file controls who is tagged for review for any given pull request.
 
 # For anything not explicitly taken by someone else:
-*       @census-instrumentation/global-owners @aabmass @c24t @hectorhdzg @lzchen @reyang @songy23 @victoraugustolls
+*       @census-instrumentation/global-owners @aabmass @hectorhdzg @lzchen @songy23 @victoraugustolls