mediamtx 1.8.1

[BrewTestBot]

Created by brew bump

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Created with brew bump-formula-pr.

release notes

## Fixes and improvements
General

fix unexpected behavior of authInternalUsers or authHTTPExclude (fix unexpected behavior of authInternalUsers or authHTTPExclude bluenviron/mediamtx#3316). when some subfields of authInternalUsers or authHTTPExclude were not set explicitly in the configuration file, default values were used in their place. This is caused by a strange behavior of Go (encoding/json: unmarshal into slice reuses element data between len and cap golang/go#21092)
fix 'no segments found' error message (fix 'no segments found' error message bluenviron/mediamtx#3323)
h264: support 4K videos encoded with tune=zerolatency (OBS Software x264 encoder tune zerolatancy  bluenviron/mediamtx#2985) (h264: support 4K videos encoded with tune=zerolatency (https://github.com/bluenviron/mediamtx/issues/2985) bluenviron/mediacommon#120)
vp9: fix crash when retrieving width / height / chroma and frame is not a key frame (vp9: fix crash when retrieving width / height / chroma and frame is not a key frame bluenviron/mediacommon#123)

RTSP

fix VP9 decoding on iOS (WHEP VP9 not playing on ios17.3.1 safari, but whip vp9 from ios17.3.1 safari can be read from macos chrome. bluenviron/mediamtx#3060) (fix VP9 decoding on iOS (https://github.com/bluenviron/mediamtx/issues/3060) bluenviron/gortsplib#553)
various performance improvements (various performance improvements bluenviron/gortsplib#561)

RTMP

fix error when reading metadata (fix rtmp server miss the opportunity to read metadata when clients send set chunk size message after publishing stream. bluenviron/mediamtx#3302). some rtmp client will send set chunk size after publish stream

WebRTC

fix error when charset is in Content-Type (The server does not work with the flutter-whip client bluenviron/mediamtx#3126) (webrtc: fix error when charset is in Content-Type (#3126) bluenviron/mediamtx#3318)

Dependencies

build(deps): bump github.com/pion/rtp from 1.8.5 to 1.8.6 (build(deps): bump github.com/pion/rtp from 1.8.5 to 1.8.6 bluenviron/mediamtx#3288)

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