Update go.mod and vendor

vendor/github.com/containerd/ttrpc/config.go

@@ -1,52 +0,0 @@
-/*
-   Copyright The containerd Authors.
-
-   Licensed under the Apache License, Version 2.0 (the "License");
-   you may not use this file except in compliance with the License.
-   You may obtain a copy of the License at
-
-       http://www.apache.org/licenses/LICENSE-2.0
-
-   Unless required by applicable law or agreed to in writing, software
-   distributed under the License is distributed on an "AS IS" BASIS,
-   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-   See the License for the specific language governing permissions and
-   limitations under the License.
-*/
-
-package ttrpc
-
-import "github.com/pkg/errors"
-
-type serverConfig struct {
-	handshaker  Handshaker
-	interceptor UnaryServerInterceptor
-}
-
-// ServerOpt for configuring a ttrpc server
-type ServerOpt func(*serverConfig) error
-
-// WithServerHandshaker can be passed to NewServer to ensure that the
-// handshaker is called before every connection attempt.
-//
-// Only one handshaker is allowed per server.
-func WithServerHandshaker(handshaker Handshaker) ServerOpt {
-	return func(c *serverConfig) error {
-		if c.handshaker != nil {
-			return errors.New("only one handshaker allowed per server")
-		}
-		c.handshaker = handshaker
-		return nil
-	}
-}
-
-// WithUnaryServerInterceptor sets the provided interceptor on the server
-func WithUnaryServerInterceptor(i UnaryServerInterceptor) ServerOpt {
-	return func(c *serverConfig) error {
-		if c.interceptor != nil {
-			return errors.New("only one interceptor allowed per server")
-		}
-		c.interceptor = i
-		return nil
-	}
-}