ffmpeg Update: Replace deprecated av_get_channel_layout_string with a…

…v_get_channel_layout_describe

```
[ 17/505|  3%] [static] libapi_server.a: C++ projects/api_server/controllers/v1/vhosts/apps/output_profiles/output_profiles_controller.cpp => intermediates/RELEASE/objs/api_server/controllers/v1/vhosts/apps/output_profiles/output_profiles_controller.o
In file included from projects/providers/multiplex/multiplex_stream.h:11,
                 from projects/providers/multiplex/multiplex_application.h:16,
                 from projects/api_server/controllers/v1/vhosts/apps/multiplex_channels/multiplex_channels_controller.cpp:13:
projects/modules/ffmpeg/ffmpeg_conv.h: In static member function ‘static ov::String ffmpeg::Conv::CodecInfoToString(const AVCodecContext*, const AVCodecParameters*)’:
projects/modules/ffmpeg/ffmpeg_conv.h:678:51: error: ‘::av_get_channel_layout_string’ has not been declared; did you mean ‘av_channel_layout_uninit’?
  678 |                                                 ::av_get_channel_layout_string(channel_layout, OV_COUNTOF(channel_layout), parameters->channels, parameters->channel_layout);
      |                                                   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
      |                                                   av_channel_layout_uninit
```

```
/**
 * Return a description of a channel layout.
 * If nb_channels is <= 0, it is guessed from the channel_layout.
 *
 * @param buf put here the string containing the channel layout
 * @param buf_size size in bytes of the buffer
 * @param nb_channels number of channels
 * @param channel_layout channel layout bitset
 * @deprecated use av_channel_layout_describe()
 */
attribute_deprecated
void av_get_channel_layout_string(char *buf, int buf_size, int nb_channels, uint64_t channel_layout);
```

src/projects/modules/ffmpeg/ffmpeg_conv.h

@@ -684,11 +684,12 @@ namespace ffmpeg
 					}
 					else
 					{
-						char channel_layout[16]{};
-						::av_get_channel_layout_string(channel_layout, OV_COUNTOF(channel_layout), parameters->channels, parameters->channel_layout);
+						char channel_layout_buf[16]{};
+
+						::av_channel_layout_describe(&parameters->ch_layout, channel_layout_buf, OV_COUNTOF(channel_layout_buf));
 
 						// 48000 Hz, stereo, fltp,
-						message.AppendFormat("%d Hz, %s(%d), %s, ", parameters->sample_rate, channel_layout, parameters->channels, ::av_get_sample_fmt_name(static_cast<AVSampleFormat>(parameters->format)));
+						message.AppendFormat("%d Hz, %s(%d), %s, ", parameters->sample_rate, channel_layout_buf, parameters->channels, ::av_get_sample_fmt_name(static_cast<AVSampleFormat>(parameters->format)));
 					}
 
 					message.AppendFormat("%d kbps, ", (parameters->bit_rate / 1024));