Upgrade dependent version: github.com/open-policy-agent/opa (#5315)

Upgrade dependent version: github.com/open-policy-agent/opa v0.18.0 -> v0.45.0

Signed-off-by: hongzhouzi <hongzhouzi@kubesphere.io>

Signed-off-by: hongzhouzi <hongzhouzi@kubesphere.io>

vendor/github.com/open-policy-agent/opa/ir/pretty.go

@@ -0,0 +1,44 @@
+// Copyright 2018 The OPA Authors.  All rights reserved.
+// Use of this source code is governed by an Apache2
+// license that can be found in the LICENSE file.
+
+package ir
+
+import (
+	"fmt"
+	"io"
+	"strings"
+)
+
+// Pretty writes a human-readable representation of an IR object to w.
+func Pretty(w io.Writer, x interface{}) error {
+
+	pp := &prettyPrinter{
+		depth: -1,
+		w:     w,
+	}
+	return Walk(pp, x)
+}
+
+type prettyPrinter struct {
+	depth int
+	w     io.Writer
+}
+
+func (pp *prettyPrinter) Before(x interface{}) {
+	pp.depth++
+}
+
+func (pp *prettyPrinter) After(x interface{}) {
+	pp.depth--
+}
+
+func (pp *prettyPrinter) Visit(x interface{}) (Visitor, error) {
+	pp.writeIndent("%T %+v", x, x)
+	return pp, nil
+}
+
+func (pp *prettyPrinter) writeIndent(f string, a ...interface{}) {
+	pad := strings.Repeat("| ", pp.depth)
+	fmt.Fprintf(pp.w, pad+f+"\n", a...)
+}