deps: update buildkit, vendor changes

Signed-off-by: Laura Brehm <laurabrehm@hey.com>

vendor/go.opentelemetry.io/otel/sdk/metric/internal/aggregate/lastvalue.go

@@ -0,0 +1,68 @@
+// 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.
+
+package aggregate // import "go.opentelemetry.io/otel/sdk/metric/internal/aggregate"
+
+import (
+	"context"
+	"sync"
+	"time"
+
+	"go.opentelemetry.io/otel/attribute"
+	"go.opentelemetry.io/otel/sdk/metric/metricdata"
+)
+
+// datapoint is timestamped measurement data.
+type datapoint[N int64 | float64] struct {
+	timestamp time.Time
+	value     N
+}
+
+func newLastValue[N int64 | float64]() *lastValue[N] {
+	return &lastValue[N]{values: make(map[attribute.Set]datapoint[N])}
+}
+
+// lastValue summarizes a set of measurements as the last one made.
+type lastValue[N int64 | float64] struct {
+	sync.Mutex
+
+	values map[attribute.Set]datapoint[N]
+}
+
+func (s *lastValue[N]) measure(ctx context.Context, value N, attr attribute.Set) {
+	d := datapoint[N]{timestamp: now(), value: value}
+	s.Lock()
+	s.values[attr] = d
+	s.Unlock()
+}
+
+func (s *lastValue[N]) computeAggregation(dest *[]metricdata.DataPoint[N]) {
+	s.Lock()
+	defer s.Unlock()
+
+	n := len(s.values)
+	*dest = reset(*dest, n, n)
+
+	var i int
+	for a, v := range s.values {
+		(*dest)[i].Attributes = a
+		// The event time is the only meaningful timestamp, StartTime is
+		// ignored.
+		(*dest)[i].Time = v.timestamp
+		(*dest)[i].Value = v.value
+		// Do not report stale values.
+		delete(s.values, a)
+		i++
+	}
+}