Update go mod and vendor in client dir to 0.28.0

client/vendor/k8s.io/apimachinery/pkg/util/sets/set.go

@@ -64,6 +64,20 @@ func (s Set[T]) Delete(items ...T) Set[T] {
 	return s
 }
 
+// Clear empties the set.
+// It is preferable to replace the set with a newly constructed set,
+// but not all callers can do that (when there are other references to the map).
+// In some cases the set *won't* be fully cleared, e.g. a Set[float32] containing NaN
+// can't be cleared because NaN can't be removed.
+// For sets containing items of a type that is reflexive for ==,
+// this is optimized to a single call to runtime.mapclear().
+func (s Set[T]) Clear() Set[T] {
+	for key := range s {
+		delete(s, key)
+	}
+	return s
+}
+
 // Has returns true if and only if item is contained in the set.
 func (s Set[T]) Has(item T) bool {
 	_, contained := s[item]