meson: update meson_version to 0.59
Mesa has updated it's meson_version to 0.59, so let's do the same for this project. After all, the current value was set to the same as what Mesa was using at the time.
Mesa has updated it's meson_version to 0.59, so let's do the same for this project. After all, the current value was set to the same as what Mesa was using at the time.