app-text: libpaper: update to version 1.28

Uprev the libpaper to the latest available version.

BUG=chromium:1207153
TEST=emerge-amd64-generic libpaper

Change-Id: Idef1563e72cf9b2f5d36ece47d8613b12548e35e
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/overlays/portage-stable/+/3024192
Reviewed-by: Benjamin Gordon <bmgordon@chromium.org>
Commit-Queue: Marcin Wojtas <mwojtas@google.com>
Tested-by: Marcin Wojtas <mwojtas@google.com>
2 files changed