build: bump version to 0.14.0
build: bump version to 0.14.0

We now bump the version number right after releases, so that a Git
snapshot is not mistaken for a previous version.

References: https://github.com/swaywm/wlroots/issues/2792

swaywm/wlroots,SirCmpwn/wlroots,swaywm/wlroots