update dependencies (#6267)

Signed-off-by: hongming <coder.scala@gmail.com>

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

@@ -25,11 +25,11 @@ type prettyPrinter struct {
 	w     io.Writer
 }
 
-func (pp *prettyPrinter) Before(x interface{}) {
+func (pp *prettyPrinter) Before(_ interface{}) {
 	pp.depth++
 }
 
-func (pp *prettyPrinter) After(x interface{}) {
+func (pp *prettyPrinter) After(_ interface{}) {
 	pp.depth--
 }