vendor: update buildkit to master@8b7bcb900d3c

Signed-off-by: Justin Chadwell <me@jedevc.com>

vendor/github.com/containerd/containerd/pkg/randutil/randutil.go

@@ -0,0 +1,48 @@
+/*
+   Copyright The containerd 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 randutil provides utilities for [cyrpto/rand].
+package randutil
+
+import (
+	"crypto/rand"
+	"math"
+	"math/big"
+)
+
+// Int63n is similar to [math/rand.Int63n] but uses [crypto/rand.Reader] under the hood.
+func Int63n(n int64) int64 {
+	b, err := rand.Int(rand.Reader, big.NewInt(n))
+	if err != nil {
+		panic(err)
+	}
+	return b.Int64()
+}
+
+// Int63 is similar to [math/rand.Int63] but uses [crypto/rand.Reader] under the hood.
+func Int63() int64 {
+	return Int63n(math.MaxInt64)
+}
+
+// Intn is similar to [math/rand.Intn] but uses [crypto/rand.Reader] under the hood.
+func Intn(n int) int {
+	return int(Int63n(int64(n)))
+}
+
+// Int is similar to [math/rand.Int] but uses [crypto/rand.Reader] under the hood.
+func Int() int {
+	return int(Int63())
+}

vendor/github.com/containerd/containerd/pkg/seed/seed.go

@@ -14,6 +14,9 @@
    limitations under the License.
 */
 
+// Package seed provides an initializer for the global [math/rand] seed.
+//
+// Deprecated: Do not rely on the global seed.
 package seed
 
 import (
@@ -23,6 +26,8 @@ import (
 
 // WithTimeAndRand seeds the global math rand generator with nanoseconds
 // XOR'ed with a crypto component if available for uniqueness.
+//
+// Deprecated: Do not rely on the global seed.
 func WithTimeAndRand() {
 	var (
 		b [4]byte