Fix warning on Emacs 30 related to deprecated (defadvice) macro

```
../lispy-20230314.1738/lispy.el: Warning: ‘defadvice’ is an obsolete macro (as of 30.1); use ‘advice-add’ or ‘define-advice’
```

From this code:

```emacs-lisp
(defadvice ac-handle-post-command (around ac-post-command-advice activate)
  "Don't `auto-complete' when region is active."
  (unless (region-active-p)
    ad-do-it))
```