remove codeowner from rbac matchers (#38630)

The listed owner is no longer involved in Envoy

Signed-off-by: Greg Greenway <[email protected]>

CODEOWNERS

@@ -124,7 +124,7 @@ extensions/filters/common/original_src @klarose @mattklein123
 /*/extensions/filters/http/grpc_json_reverse_transcoder @numanelahi @yanavlasov
 /*/extensions/filters/http/grpc_json_transcoder @taoxuy @nareddyt @nezdolik
 /*/extensions/filters/http/router @yanavlasov @mattklein123
-/*/extensions/filters/common/rbac/matchers @conqerAtapple @ggreenway
+/*/extensions/filters/common/rbac/matchers @ggreenway @UNOWNED
 /*/extensions/filters/http/grpc_web @fengli79 @kyessenov
 /*/extensions/filters/http/grpc_stats @kyessenov @botengyao @nezdolik
 /*/extensions/filters/http/connect_grpc_bridge @jchadwick-buf @mattklein123