chore: Remove old CODEOWNERS (#7633)

Author: mattrunyon

.github/CODEOWNERS

@@ -23,7 +23,7 @@
 /engine/function/ @chipkent @kosak @rcaudy @cpwright
 /py @chipkent @jmao-denver @rcaudy @cpwright
 /R @chipkent @rcaudy @cpwright @kosak
-*.proto @devinrsmith @nbauernfeind @niloc132 @rcaudy @cpwright
-*.gwt.xml @niloc132 @rcaudy @nbauernfeind @cpwright
+*.proto @devinrsmith @niloc132 @rcaudy @cpwright
+*.gwt.xml @niloc132 @rcaudy @cpwright
 /docs/**/*.md @margaretkennedy @elijahpetty @rcaudy
 /gradle @devinrsmith @rcaudy