Remove dierksen from CODEOWNERS.

PiperOrigin-RevId: 236347973
diff --git a/CODEOWNERS b/CODEOWNERS
index 6ccc6a5..b386ff0 100644
--- a/CODEOWNERS
+++ b/CODEOWNERS
@@ -1 +1 @@
-* @dierksen @DavidGoldman @reinhillmann @ivanhernandez13
+* @DavidGoldman @reinhillmann @ivanhernandez13