message: Update the year to 2023.
diff: [Mozc - a Japanese Input Method Editor designed for multi-platform](https://github.com/google/mozc)
  ===================================
  -Copyright 2010-2022, Google Inc.
  +Copyright 2010-2023, Google Inc.
  Mozc is a Japanese Input Method Editor (IME) designed for multi-platform such as
  Android OS, Apple OS X, Chromium OS, GNU/Linux and Microsoft Windows. This
  