[snap] upgrade to 4.2.2
Upgrade the snap to 4.2.2. This is now live on snapcraft.io
@rempt I had to downgrade the libmypaint dependency since the snap is built in an Ubuntu 18.04 VM which has an older version of the library.
Upgrade the snap to 4.2.2. This is now live on snapcraft.io
@rempt I had to downgrade the libmypaint dependency since the snap is built in an Ubuntu 18.04 VM which has an older version of the library.