Update deps in membrane demo examples

[bartkrak]

Update packages in all membrane demo examples to versions used in new membrane SDK demo. List of demos to update:

• [x] camera_to_hls @bartkrak
• [x] camera_to_hls_nerves @Noarkhh
• [x] mix_audio @bartkrak
• [x] rtmp_to_hls @FelonEkonom
• [x] rtp @bartkrak
• [x] rtp_to_hls @mat-hek
• [x] rtsp_to_hls @Noarkhh
• [x] simple_element @bartkrak
• [x] simple_pipeline @bartkrak
• [x] livebooks
  • [x] audio_mixer @bartkrak
  • [x] messages_source_and_sink @bartkrak
  • [x] playing_mp3_file @mat-hek
  • [x] rtmp @bartkrak
  • [x] soundwave @bartkrak
  • [x] speech_to_text @bartkrak

Note: Before you start add your github nick next to the demo you are working on. All stuff is expected to be done by April 18th.