package/wpewebkit: bump to version 2.26.1

Release notes:

  https://wpewebkit.org/release/wpewebkit-2.26.1.html



This is a bugfix release which fixes a few issues deteted in 2.26.0
and includes media playback improvements as well.

Signed-off-by: Adrian Perez de Castro <aperez@igalia.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>