Update go dependencies

vendor/golang.org/x/xerrors/errors.go

@@ -1,33 +0,0 @@
-// Copyright 2011 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-package xerrors
-
-import "fmt"
-
-// errorString is a trivial implementation of error.
-type errorString struct {
-	s     string
-	frame Frame
-}
-
-// New returns an error that formats as the given text.
-//
-// The returned error contains a Frame set to the caller's location and
-// implements Formatter to show this information when printed with details.
-func New(text string) error {
-	return &errorString{text, Caller(1)}
-}
-
-func (e *errorString) Error() string {
-	return e.s
-}
-
-func (e *errorString) Format(s fmt.State, v rune) { FormatError(e, s, v) }
-
-func (e *errorString) FormatError(p Printer) (next error) {
-	p.Print(e.s)
-	e.frame.Format(p)
-	return nil
-}