build: Update RTSP server image and version

[jinlinGuan]

replace aler9/rtsp-simple-server with bluenviron/mediamtx, and upgrade to v1.8.2

closed #272

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Please check if your PR fulfills the following requirements:

• [x] I am not introducing a breaking change (if you are, flag in conventional commit message with BREAKING CHANGE: describing the break)
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[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 4.75%. Comparing base (068bc12) to head (655e03c).

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #334 +/- ## ===================================== Coverage 4.75% 4.75% ===================================== Files 8 8 Lines 1305 1305 ===================================== Hits 62 62 Misses 1243 1243 ```

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