package/libwpe: security bump to version 1.12.3

This update fixes a potential memory allocation issue. There is no
associated advisory, though. Release notes:

  https://wpewebkit.org/release/libwpe-1.12.1.html
  https://wpewebkit.org/release/libwpe-1.12.2.html
  https://wpewebkit.org/release/libwpe-1.12.3.html



Signed-off-by: Adrian Perez de Castro <aperez@igalia.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>