AJAX returns response 0

Your action hook should be 

add_action( 'wp_ajax_cc_author_change_postauthor', 'cc_author_change_postauthor_callback' );

I think because of your wrong hook, your callback function is never called.

You might have got this wrong aswell. In your JS code please change your action from 

cc-author-change-postauthor

to 

cc_author_change_postauthor

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