Update usage for dart 3.3.1

Author: dannnnthemannnn

lib/pattern.dart

@@ -34,7 +34,7 @@ String escapeRegex(String str) => str.splitMapJoin(_specialChars,
 Pattern matchAny(Iterable<Pattern> include, {Iterable<Pattern>? exclude}) =>
     _MultiPattern(include, exclude: exclude);
 
-class _MultiPattern extends Pattern {
+class _MultiPattern implements Pattern {
   _MultiPattern(this.include, {this.exclude});
 
   final Iterable<Pattern> include;

lib/src/iterables/enumerate.dart

@@ -71,7 +71,7 @@ class EnumerateIterable<V> extends IterableBase<IndexedValue<V>> {
 }
 
 /// The [Iterator] returned by [EnumerateIterable.iterator].
-class EnumerateIterator<V> extends Iterator<IndexedValue<V>> {
+class EnumerateIterator<V> implements Iterator<IndexedValue<V>> {
   EnumerateIterator(this._iterator);
 
   final Iterator<V> _iterator;