chore: upgrade coredns version (#550)

vendor/github.com/expr-lang/expr/ast/find.go

@@ -0,0 +1,18 @@
+package ast
+
+func Find(node Node, fn func(node Node) bool) Node {
+	v := &finder{fn: fn}
+	Walk(&node, v)
+	return v.node
+}
+
+type finder struct {
+	node Node
+	fn   func(node Node) bool
+}
+
+func (f *finder) Visit(node *Node) {
+	if f.fn(*node) {
+		f.node = *node
+	}
+}