Update codeowners to match experts list change (#10022)

Author: ncoghlan

.github/CODEOWNERS

@@ -59,7 +59,7 @@ Python/bootstrap_hash.c       @python/crypto-team
 **/*queue*                    @rhettinger
 **/*bisect*                   @rhettinger
 **/*heapq*                    @rhettinger
-**/*functools*                @ncoghlan @rhettinger
+**/*functools*                @rhettinger
 **/*decimal*                  @rhettinger @skrah
 
 **/*dataclasses*              @ericvsmith