Bump to `2.14.0` - fixes issues related to `m4a` files.

Fixes #27570.



git-svn-id: https://develop.svn.wordpress.org/trunk@27811 602fd350-edb4-49c9-b593-d223f7449a82
When creating a new playlist, we don't know from the model what "type" it is right away (there is no longer a `video-playlist` shortcode) - we need to check the controller's library's prop for `type` when deciding what settings to display in the modal.

See #27535.



git-svn-id: https://develop.svn.wordpress.org/trunk@27812 602fd350-edb4-49c9-b593-d223f7449a82