chore: upgrade coredns version (#550)

vendor/github.com/expr-lang/expr/optimizer/sum_map.go

@@ -0,0 +1,25 @@
+package optimizer
+
+import (
+	. "github.com/expr-lang/expr/ast"
+)
+
+type sumMap struct{}
+
+func (*sumMap) Visit(node *Node) {
+	if sumBuiltin, ok := (*node).(*BuiltinNode); ok &&
+		sumBuiltin.Name == "sum" &&
+		len(sumBuiltin.Arguments) == 1 {
+		if mapBuiltin, ok := sumBuiltin.Arguments[0].(*BuiltinNode); ok &&
+			mapBuiltin.Name == "map" &&
+			len(mapBuiltin.Arguments) == 2 {
+			patchCopyType(node, &BuiltinNode{
+				Name: "sum",
+				Arguments: []Node{
+					mapBuiltin.Arguments[0],
+					mapBuiltin.Arguments[1],
+				},
+			})
+		}
+	}
+}