~/.config/sway: Control volume using pactl

I had an odd bug where the minimum volume with alsa was jumping a lot.
In addition there was a bug where with pipewire sometimes an output
could not be controlled at all anymore.

.config/sway/config

@@ -104,9 +104,9 @@ input type:touchpad events disabled
    bindsym $mod+Shift+l exec swaylock --color 000000
    bindsym XF86AudioLowerVolume exec amixer set Master 5%-
    bindsym XF86AudioRaiseVolume exec amixer set Master 5%+
    bindsym XF86AudioMute        exec amixer set Master toggle
    bindsym XF86AudioLowerVolume exec pactl set-sink-volume @DEFAULT_SINK@ -5%
    bindsym XF86AudioRaiseVolume exec pactl set-sink-volume @DEFAULT_SINK@ +5%
    bindsym XF86AudioMute        exec pactl set-sink-mute   @DEFAULT_SINK@ toggle
    bindsym XF86AudioPlay        exec playerctl play-pause
    bindsym $mod+Shift+f exec ~/.bin/toggle-fan