vendor: update buildkit to master@ae9d0f5

Signed-off-by: Justin Chadwell <me@jedevc.com>

vendor/github.com/moby/buildkit/solver/result/attestation.go

@@ -0,0 +1,36 @@
+package result
+
+import (
+	pb "github.com/moby/buildkit/frontend/gateway/pb"
+	digest "github.com/opencontainers/go-digest"
+)
+
+type Attestation struct {
+	Kind pb.AttestationKind
+
+	Ref  string
+	Path string
+
+	InToto      InTotoAttestation
+	ContentFunc func() ([]byte, error)
+}
+
+type InTotoAttestation struct {
+	PredicateType string
+	Subjects      []InTotoSubject
+}
+
+type InTotoSubject struct {
+	Kind pb.InTotoSubjectKind
+
+	Name   string
+	Digest []digest.Digest
+}
+
+func DigestMap(ds ...digest.Digest) map[string]string {
+	m := map[string]string{}
+	for _, d := range ds {
+		m[d.Algorithm().String()] = d.Encoded()
+	}
+	return m
+}