Update dependencies

vendor/tailscale.com/syncs/shardvalue.go

@@ -0,0 +1,36 @@
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
+
+package syncs
+
+// TODO(raggi): this implementation is still imperfect as it will still result
+// in cross CPU sharing periodically, we instead really want a per-CPU shard
+// key, but the limitations of calling platform code make reaching for even the
+// getcpu vdso very painful. See https://github.com/golang/go/issues/18802, and
+// hopefully one day we can replace with a primitive that falls out of that
+// work.
+
+// ShardValue contains a value sharded over a set of shards.
+// In order to be useful, T should be aligned to cache lines.
+// Users must organize that usage in One and All is concurrency safe.
+// The zero value is not safe for use; use [NewShardValue].
+type ShardValue[T any] struct {
+	shards []T
+
+	//lint:ignore U1000 unused under tailscale_go builds.
+	pool shardValuePool
+}
+
+// Len returns the number of shards.
+func (sp *ShardValue[T]) Len() int {
+	return len(sp.shards)
+}
+
+// All yields a pointer to the value in each shard.
+func (sp *ShardValue[T]) All(yield func(*T) bool) {
+	for i := range sp.shards {
+		if !yield(&sp.shards[i]) {
+			return
+		}
+	}
+}