Try to clear the browser cash or activate debug with assets (going to /web?debug=assets)
if this not worked and you can't access to the apps to upgrade module whatsapp_mail_messaging, you can do update the module from command line:

Locate ./odoo-bin file run the below command
./odoo-bin -c /etc/odoo.conf -u module_name -d database_name
-c odoo configuration file path
-u odoo module name
-d database name

Thanks for your reply, Debug with assets (going to /web?debug=assets) it is working well,
But for some users, we can not allow debugging users, so how we can solve undebug mode?