Update ABI version to 16.16

Functions changes summary: 0 Removed, 0 Changed, 1 Added function
Variables changes summary: 0 Removed, 0 Changed, 0 Added variable

1 Added function:

  [A] 'function GF_Err gf_odf_iamf_cfg_write_obus(GF_IAConfig*, GF_BitStream*)'    {gf_odf_iamf_cfg_write_obus}