[FIX] website: changing menu sequence clear menu cache

As of 02e01dce the website menu is prefetched for the user and saved
in cache.

If the sequence of a menu is changed (eg. with the "Edit Menu" modal on
website), the cache was not cleared so it seemed like this did not work.

With this changeset, changing a menu sequence will clear ormcache.

opw-2244908
closes #50683

closes odoo/odoo#50703

X-original-commit: 8da3276e
Signed-off-by: Nicolas Lempereur (nle) <nle@odoo.com>