vendor: update buildkit to v0.18.0-rc1

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

vendor/go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp/client.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 otelhttp // import "go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp"
 
@@ -23,7 +12,7 @@ import (
 )
 
 // DefaultClient is the default Client and is used by Get, Head, Post and PostForm.
-// Please be careful of intitialization order - for example, if you change
+// Please be careful of initialization order - for example, if you change
 // the global propagator, the DefaultClient might still be using the old one.
 var DefaultClient = &http.Client{Transport: NewTransport(http.DefaultTransport)}