vendor: update buildkit to v0.18.0-rc1

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

vendor/go.opentelemetry.io/otel/sdk/metric/reader.go

@@ -1,16 +1,5 @@
 // Copyright The OpenTelemetry Authors
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
+// SPDX-License-Identifier: Apache-2.0
 
 package metric // import "go.opentelemetry.io/otel/sdk/metric"
 
@@ -159,7 +148,7 @@ func DefaultAggregationSelector(ik InstrumentKind) Aggregation {
 	switch ik {
 	case InstrumentKindCounter, InstrumentKindUpDownCounter, InstrumentKindObservableCounter, InstrumentKindObservableUpDownCounter:
 		return AggregationSum{}
-	case InstrumentKindObservableGauge:
+	case InstrumentKindObservableGauge, InstrumentKindGauge:
 		return AggregationLastValue{}
 	case InstrumentKindHistogram:
 		return AggregationExplicitBucketHistogram{
@@ -177,7 +166,7 @@ type ReaderOption interface {
 	ManualReaderOption
 }
 
-// WithProducers registers producers as an external Producer of metric data
+// WithProducer registers producers as an external Producer of metric data
 // for this Reader.
 func WithProducer(p Producer) ReaderOption {
 	return producerOption{p: p}