Update go2rtc version

[NickM-27]

Improvements include:

• Support for RTSP auth (added via go2rtc yaml config)
• new tracks can be added after initial stream is started (camera that doesn't have audio for first x seconds can have audio added without restarting stream)
• Fix MSE Empty SPS issue with h.265
• Improve webRTC delay on startup
• Fix race conditions for processing
• Fix issue when no audio but multiple audio codecs are specified
• Remove log warning when websocket is disconnected normally

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[blakeblackshear]

It sounded like there were some frontend changes too. Do we need to make any Javascript changes?

[NickM-27]

There's a rewritten MSE player but I wasn't sure if we should adopt that since the current one works still. it also seems a bit more complicated to integrate. May be easier to do that in a separate PR.