Nextcloud 19 : $ is deprecated

I have installed Nextcloud 19 and when I open my console I have the following output :

$ is deprecated: The global jQuery is deprecated. It will be updated to v2.4 in Nextcloud 20 and v3.x in Nextcloud 21. In later versions of Nextcloud it might be removed completely. Please ship your own.

What can I do to get rid of the messages ?