fix: Codeowners for benchmarking metrics AD (#2784)

Author: SebastianSchmidl

CODEOWNERS

@@ -5,6 +5,7 @@
 aeon/anomaly_detection/ @SebastianSchmidl @MatthewMiddlehurst
 
 aeon/benchmarking/ @TonyBagnall @MatthewMiddlehurst @hadifawaz1999 @dguijo
+aeon/benchmarking/metrics/anomaly_detection/ @SebastianSchmidl @MatthewMiddlehurst
 
 aeon/classification/ @MatthewMiddlehurst @TonyBagnall
 aeon/classification/deep_learning/ @hadifawaz1999 @MatthewMiddlehurst @TonyBagnall
@@ -17,8 +18,6 @@ aeon/distances/ @chrisholder @TonyBagnall
 
 aeon/networks/ @hadifawaz1999
 
-aeon/performance_metrics/anomaly_detection/ @SebastianSchmidl @MatthewMiddlehurst
-
 aeon/regression/ @MatthewMiddlehurst @TonyBagnall @dguijo
 aeon/regression/deep_learning @hadifawaz1999 @MatthewMiddlehurst @TonyBagnall @dguijo