vendor: update buildkit to v0.11.0-rc4

Signed-off-by: Tonis Tiigi <tonistiigi@gmail.com>
Signed-off-by: Justin Chadwell <me@jedevc.com>

vendor/github.com/moby/buildkit/util/tracing/detect/threadsafe.go

@@ -0,0 +1,26 @@
+package detect
+
+import (
+	"context"
+	"sync"
+
+	sdktrace "go.opentelemetry.io/otel/sdk/trace"
+)
+
+// threadSafeExporterWrapper wraps an OpenTelemetry SpanExporter and makes it thread-safe.
+type threadSafeExporterWrapper struct {
+	mu       sync.Mutex
+	exporter sdktrace.SpanExporter
+}
+
+func (tse *threadSafeExporterWrapper) ExportSpans(ctx context.Context, spans []sdktrace.ReadOnlySpan) error {
+	tse.mu.Lock()
+	defer tse.mu.Unlock()
+	return tse.exporter.ExportSpans(ctx, spans)
+}
+
+func (tse *threadSafeExporterWrapper) Shutdown(ctx context.Context) error {
+	tse.mu.Lock()
+	defer tse.mu.Unlock()
+	return tse.exporter.Shutdown(ctx)
+}