libvterm v0.3 supports reflow of terminal buffer when Nvim is resized
Since v0.3 is now a required dependency, enable it by default to find
(and fix) possible issues.
Note: Neovim's scrollback buffer does not support reflow (yet), so lines
vanishing into the buffer due to a too small window will be restored
without reflow.
The cmake.deps build will read this file and set the left part of the
text as the variable name and the right part as the variable value. The
benefit of doing this is that it becomes much easier to parse which
dependencies are required, as well as to bump dependencies with
scripts/bump_deps.lua.
Adjust bump_deps.lua script to work with this new format.
