common-aliases: fix loading of is-at-least function (#6215)

plugins/common-aliases/common-aliases.plugin.zsh

@@ -50,6 +50,7 @@ alias mv='mv -i'
 
 # zsh is able to auto-do some kungfoo
 # depends on the SUFFIX :)
+autoload -Uz is-at-least
 if is-at-least 4.2.0; then
   # open browser on urls
   if [[ -n "$BROWSER" ]]; then