vendor: update buildkit to 93b40706a007

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

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

@@ -1,6 +1,8 @@
 package result
 
 import (
+	"reflect"
+
 	pb "github.com/moby/buildkit/frontend/gateway/pb"
 	digest "github.com/opencontainers/go-digest"
 )
@@ -15,12 +17,12 @@ var (
 	AttestationReasonProvenance = []byte("provenance")
 )
 
-type Attestation struct {
+type Attestation[T any] struct {
 	Kind pb.AttestationKind
 
 	Metadata map[string][]byte
 
-	Ref         string
+	Ref         T
 	Path        string
 	ContentFunc func() ([]byte, error)
 
@@ -54,3 +56,23 @@ func FromDigestMap(m map[string]string) []digest.Digest {
 	}
 	return ds
 }
+
+func ConvertAttestation[U any, V any](a *Attestation[U], fn func(U) (V, error)) (*Attestation[V], error) {
+	var ref V
+	if reflect.ValueOf(a.Ref).IsValid() {
+		var err error
+		ref, err = fn(a.Ref)
+		if err != nil {
+			return nil, err
+		}
+	}
+
+	return &Attestation[V]{
+		Kind:        a.Kind,
+		Metadata:    a.Metadata,
+		Ref:         ref,
+		Path:        a.Path,
+		ContentFunc: a.ContentFunc,
+		InToto:      a.InToto,
+	}, nil
+}