[FIX] website: migrate popover in BS5

Since we've changed Bootstrap version from 4 to 5 the way to create a
popover has changed.

So we adapt it to the new way to declare popovers in the website form

closes odoo/odoo#119680

X-original-commit: 0cff1dc2967cafeb8964ed0802c309d3bb7f7525
Signed-off-by: Masereel Pierre <pim@odoo.com>

addons/website/static/src/snippets/s_website_form/000.js

@@ -463,7 +463,8 @@
                     if (typeof error_fields[field_name] === "string") {
                         $field.popover({content: error_fields[field_name], trigger: 'hover', container: 'body', placement: 'top'});
                         // update error message and show it.
-                        $field.data("bs.popover").config.content = error_fields[field_name];
+                        const popover = Popover.getInstance($field);
+                        popover._config.content = error_fields[field_name];
                         $field.popover('show');
                     }
                     form_valid = false;