Update go.mod and vendor

vendor/github.com/moby/buildkit/client/connhelper/connhelper.go

@@ -1,37 +0,0 @@
-// Package connhelper provides helpers for connecting to a remote daemon host with custom logic.
-package connhelper
-
-import (
-	"context"
-	"net"
-	"net/url"
-)
-
-var helpers = map[string]func(*url.URL) (*ConnectionHelper, error){}
-
-// ConnectionHelper allows to connect to a remote host with custom stream provider binary.
-type ConnectionHelper struct {
-	// ContextDialer can be passed to grpc.WithContextDialer
-	ContextDialer func(ctx context.Context, addr string) (net.Conn, error)
-}
-
-// GetConnectionHelper returns BuildKit-specific connection helper for the given URL.
-// GetConnectionHelper returns nil without error when no helper is registered for the scheme.
-func GetConnectionHelper(daemonURL string) (*ConnectionHelper, error) {
-	u, err := url.Parse(daemonURL)
-	if err != nil {
-		return nil, err
-	}
-
-	fn, ok := helpers[u.Scheme]
-	if !ok {
-		return nil, nil
-	}
-
-	return fn(u)
-}
-
-// Register registers new connectionhelper for scheme
-func Register(scheme string, fn func(*url.URL) (*ConnectionHelper, error)) {
-	helpers[scheme] = fn
-}