Fix deprecated/removed audio channel apis

[HO-COOH]

This tutorial really helped me a lot, thanks. I am following along with the latest ffmpeg 8.1, and here are some code fix for the removed apis. This also closes #140

[leandromoreira]

thanks @HO-COOH I think we also must change the docker image, and maybe let it clear on documentation which version we're using, wdyt?

[leandromoreira]

[4](https://github.com/leandromoreira/ffmpeg-libav-tutorial/actions/runs/23700732682/job/69084070418?pr=147#step:3:35)
/files/0_hello_world.c: In function 'main':
/files/0_hello_world.c:123:82: error: 'AVCodecParameters' {aka 'struct AVCodecParameters'} has no member named 'ch_layout'; did you mean 'channel_layout'?
  123 |       logging("Audio Codec: %d channels, sample rate %d", pLocalCodecParameters->ch_layout.nb_channels, pLocalCodecParameters->sample_rate);
      |                                                                                  ^~~~~~~~~
      |                                                                                  channel_layout
      ````

[leandromoreira]

probably https://github.com/leandromoreira/ffmpeg-libav-tutorial/blob/master/Dockerfile#L19

[HO-COOH]

thanks @HO-COOH I think we also must change the docker image, and maybe let it clear on documentation which version we're using, wdyt?

Yes that will be great. Please trigger the workflow, and if it success I will add some README about this

[leandromoreira]

I think I need to actually update Docker and push it, or use the local dockerfile