Update dependencies

vendor/tailscale.com/util/truncate/truncate.go

@@ -0,0 +1,31 @@
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
+
+// Package truncate provides a utility function for safely truncating UTF-8
+// strings to a fixed length, respecting multi-byte codepoints.
+package truncate
+
+// String returns a prefix of a UTF-8 string s, having length no greater than n
+// bytes. If s exceeds this length, it is truncated at a point ≤ n so that the
+// result does not end in a partial UTF-8 encoding.  If s is less than or equal
+// to this length, it is returned unmodified.
+func String[String ~string | ~[]byte](s String, n int) String {
+	if n >= len(s) {
+		return s
+	}
+
+	// Back up until we find the beginning of a UTF-8 encoding.
+	for n > 0 && s[n-1]&0xc0 == 0x80 { // 0x10... is a continuation byte
+		n--
+	}
+
+	// If we're at the beginning of a multi-byte encoding, back up one more to
+	// skip it. It's possible the value was already complete, but it's simpler
+	// if we only have to check in one direction.
+	//
+	// Otherwise, we have a single-byte code (0x00... or 0x01...).
+	if n > 0 && s[n-1]&0xc0 == 0xc0 { // 0x11... starts a multibyte encoding
+		n--
+	}
+	return s[:n]
+}