Update codeowners to match experts list change (#10022)

diff --git a/.github/CODEOWNERS b/.github/CODEOWNERS
index 2e98e14..4d4d352 100644
--- a/.github/CODEOWNERS
+++ b/.github/CODEOWNERS
@@ -59,7 +59,7 @@
 **/*queue*                    @rhettinger
 **/*bisect*                   @rhettinger
 **/*heapq*                    @rhettinger
-**/*functools*                @ncoghlan @rhettinger
+**/*functools*                @rhettinger
 **/*decimal*                  @rhettinger @skrah
 
 **/*dataclasses*              @ericvsmith