Replace deprecated functions

lib/src/lints/member_ordering/config_parser.dart

@@ -71,7 +71,7 @@ class MemberOrderingConfigParser {
         ? List<String>.from(orderConfig)
         : _defaultOrderList;
 
-    return order.map(_parseGroup).whereNotNull().toList();
+    return order.map(_parseGroup).nonNulls.toList();
   }
 
   /// Parse rule config for widget class order rules
@@ -80,7 +80,7 @@ class MemberOrderingConfigParser {
         ? List<String>.from(widgetsOrderConfig)
         : _defaultWidgetsOrderList;
 
-    return widgetsOrder.map(_parseGroup).whereNotNull().toList();
+    return widgetsOrder.map(_parseGroup).nonNulls.toList();
   }
 
   static MemberGroup? _parseGroup(String group) {

lib/src/lints/member_ordering/member_ordering_utils.dart

@@ -7,7 +7,7 @@ import 'package:solid_lints/src/lints/member_ordering/models/modifier.dart';
 Annotation? parseAnnotation(AnnotatedNode node) {
   return node.metadata
       .map((metadata) => Annotation.parse(metadata.name.name))
-      .whereNotNull()
+      .nonNulls
       .firstOrNull;
 }