Add ping to notify ignore list

utilities/utilities.plugin.zsh

@@ -46,7 +46,7 @@ notify() {
 # Send a desktop notification when long running commands complete.
 notify_command_threshold=60
 notify_ignore_list=(
-  cmatrix gh git glab man nvim ssh sudo sudoedit tmux vi vim
+  cmatrix gh git glab man nvim ping ssh sudo sudoedit tmux vi vim
 )
 
 notify-ignore() {