message: Fix usage of sprintf.
  sprintf is marked as deprecated with Xcode 14.
  Cr-Commit-Position: refs/heads/main@{#37136}
diff: @@ -305,7 +305,7 @@ HttpAuthResult HttpAuthenticate(absl::string_view challenge,
  std::string cnonce, ncount;
  char buffer[256];
  - sprintf(buffer, "%d", static_cast<int>(time(0)));
  + snprintf(buffer, sizeof(buffer), "%d", static_cast<int>(time(0)));
  cnonce = MD5(buffer);
  ncount = "00000001";
  