sway: manually update version in meson.build

This wasn't done upstream. Adapted from:

https://github.com/primeos/nixpkgs-primeos/blob/5956e993dd320183f943e72fd6ec200232900249/default.nix#L32-L34

Co-Authored-By: Michael Weiss <dev.primeos@gmail.com>

pkgs/applications/window-managers/sway/default.nix

@@ -41,6 +41,10 @@ stdenv.mkDerivation rec {
     wrapProgram $out/bin/sway --prefix PATH : "${swaybg}/bin"
   '';
 
+  postPatch = ''
+    sed -i "s/version: '1.0'/version: '${version}'/" meson.build
+  '';
+
   meta = with stdenv.lib; {
     description = "i3-compatible tiling Wayland compositor";
     homepage    = https://swaywm.org;