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:

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