vendor: update buildkit to 8effd45b

Signed-off-by: Tonis Tiigi <tonistiigi@gmail.com>

vendor/github.com/moby/buildkit/client/llb/source.go

@@ -5,7 +5,6 @@ import (
 	_ "crypto/sha256" // for opencontainers/go-digest
 	"encoding/json"
 	"os"
-	"regexp"
 	"strconv"
 	"strings"
 
@@ -207,8 +206,6 @@ const (
 	gitProtocolUnknown
 )
 
-var gitSSHRegex = regexp.MustCompile("^([a-z0-9]+@)?[^:]+:.*$")
-
 func getGitProtocol(remote string) (string, int) {
 	prefixes := map[string]int{
 		"http://":  gitProtocolHTTP,
@@ -224,7 +221,7 @@ func getGitProtocol(remote string) (string, int) {
 		}
 	}
 
-	if protocolType == gitProtocolUnknown && gitSSHRegex.MatchString(remote) {
+	if protocolType == gitProtocolUnknown && sshutil.IsImplicitSSHTransport(remote) {
 		protocolType = gitProtocolSSH
 	}
 
@@ -254,6 +251,9 @@ func Git(remote, ref string, opts ...GitOption) State {
 			remote = parts[0] + "/" + parts[1]
 		}
 	}
+	if protocolType == gitProtocolUnknown {
+		url = "https://" + url
+	}
 
 	id := remote