doc: releases: Add entry for bt_bap_ep_get_conn

Add entry for the new function bt_bap_ep_get_conn.

Signed-off-by: Emil Gydesen <[email protected]>

Author: Thalley

doc/releases/release-notes-4.3.rst

@@ -114,6 +114,7 @@ New APIs and options
     * :c:struct:`bt_bap_stream` now contains an ``iso`` field as a reference to the ISO channel
     * :c:func:`bt_bap_unicast_group_get_info`
     * :c:func:`bt_cap_unicast_group_get_info`
+    * :c:func:`bt_bap_ep_get_conn`
 
   * Host