Version mismatch with libwpewebkit in focal

[glancr team]

Hello maintainers,

thank you for importing cog + WPE libraries from Debian upstream to the focal repositories, really helps me maintain the wpe-webkit-mir-kiosk snap [1].

The cog version included in focal is at 0.4.0-2, but the WPE team recommends cog 0.6.x for use with WPE 2.28.x [3].

My snap currently builds cog from source because of this, but it would be helpful to just pull in the prebuilt package – and I guess other users of this package could run into issues when they just use the provided packages.

I also filed a question regarding updates with:
* libwpebackend-fdo – focal at 1.6.0-1, upstream at 1.6.1
* libwpewebkit – focal at 2.28.1-1, upstream at 2.28.4

Thanks in advance,
Tobias

[1] https://snapcraft.io/wpe-webkit-mir-kiosk
[2] https://wpewebkit.org/release/schedule/
[2] https://wpewebkit.org/code/