vendor: update buildkit to v0.19.0-rc1

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

vendor/github.com/aws/aws-sdk-go-v2/internal/context/context.go

@@ -0,0 +1,52 @@
+package context
+
+import (
+	"context"
+	"time"
+
+	"github.com/aws/smithy-go/middleware"
+)
+
+type s3BackendKey struct{}
+type checksumInputAlgorithmKey struct{}
+type clockSkew struct{}
+
+const (
+	// S3BackendS3Express identifies the S3Express backend
+	S3BackendS3Express = "S3Express"
+)
+
+// SetS3Backend stores the resolved endpoint backend within the request
+// context, which is required for a variety of custom S3 behaviors.
+func SetS3Backend(ctx context.Context, typ string) context.Context {
+	return middleware.WithStackValue(ctx, s3BackendKey{}, typ)
+}
+
+// GetS3Backend retrieves the stored endpoint backend within the context.
+func GetS3Backend(ctx context.Context) string {
+	v, _ := middleware.GetStackValue(ctx, s3BackendKey{}).(string)
+	return v
+}
+
+// SetChecksumInputAlgorithm sets the request checksum algorithm on the
+// context.
+func SetChecksumInputAlgorithm(ctx context.Context, value string) context.Context {
+	return middleware.WithStackValue(ctx, checksumInputAlgorithmKey{}, value)
+}
+
+// GetChecksumInputAlgorithm returns the checksum algorithm from the context.
+func GetChecksumInputAlgorithm(ctx context.Context) string {
+	v, _ := middleware.GetStackValue(ctx, checksumInputAlgorithmKey{}).(string)
+	return v
+}
+
+// SetAttemptSkewContext sets the clock skew value on the context
+func SetAttemptSkewContext(ctx context.Context, v time.Duration) context.Context {
+	return middleware.WithStackValue(ctx, clockSkew{}, v)
+}
+
+// GetAttemptSkewContext gets the clock skew value from the context
+func GetAttemptSkewContext(ctx context.Context) time.Duration {
+	x, _ := middleware.GetStackValue(ctx, clockSkew{}).(time.Duration)
+	return x
+}