Summernote was updated alongside the new editor of saas-12.2. However,
since we are putting back the editor of 12.0, summernote needs to be
downgraded back to the version that was compatible with the 12.0 editor.
This is a revert of 17c6d005.
Part of PR 35677.
Co-authored-by: Nicolas Bayet <nby@odoo.com>
Co-authored-by: Antoine Guenet <age@odoo.com>
Co-authored-by: Christophe Matthieu <chm@odoo.com>
Co-authored-by: David Monjoie <dmo@odoo.com>