deps: update buildkit, vendor changes

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

vendor/go.opentelemetry.io/otel/exporters/otlp/otlpmetric/doc.go

@@ -0,0 +1,20 @@
+// 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 otlpmetric provides an OpenTelemetry metric Exporter that can be
+// used with PeriodicReader. It transforms metricdata into OTLP and transmits
+// the transformed data to OTLP receivers. The Exporter is configurable to use
+// different Clients, each using a distinct transport protocol to communicate
+// to an OTLP receiving endpoint.
+package otlpmetric // import "go.opentelemetry.io/otel/exporters/otlp/otlpmetric"