sway: 1.6.1 -> 1.7

Release notes: https://github.com/swaywm/sway/releases/tag/1.7

Notable (backward incompatible) changes:
- The default terminal changed from Alacritty to foot

Known issues:
- `swaynag` will crash when Sway 1.6.1 is still running while the Nix
  package (and thus `swaynag`) is already updated to version 1.7.
- The experimental Ozone/Wayland support of Electron apps will be broken
  for a while. Electron version 17 should work but the Chromium fixes
  haven't yet been backported to Electron version 16.

NixOS module: programs.sway.extraPackages: The "alacritty" package was
replaced with "foot".

VM test: We switched from the OpenGL ES 2.0 renderer to Pixman. The
terminal was also changed to foot but Alacritty is still used for the
XWayland test (since foot doesn't support X11).

Co-authored-by: Patrick Hilhorst <git@hilhorst.be>

nixos/modules/programs/sway.nix

@@ -90,10 +90,10 @@ in {
     extraPackages = mkOption {
       type = with types; listOf package;
       default = with pkgs; [
-        swaylock swayidle alacritty dmenu
+        swaylock swayidle foot dmenu
       ];
       defaultText = literalExpression ''
-        with pkgs; [ swaylock swayidle alacritty dmenu ];
+        with pkgs; [ swaylock swayidle foot dmenu ];
       '';
       example = literalExpression ''
         with pkgs; [