Fix music bot example

[conr]

Fixes for a bunch of Typescript errors in the music bot example.

[conr]

Already included in the parent tsconfig.json https://github.com/discordjs/voice/blob/main/tsconfig.json#L29

[conr]

Types for the flags were added to youtube-dl-exec in this commit.

[almeidx]

Should probably bump youtube-dl-exec to the latest version.
And while you're at it, why not bump typescript to the latest version as well instead of 4.4?

[conr]

@almeidx Good call. Updated 👍🏻

[conr]

@iCrawl Is this good to go?

[codecov]

Codecov Report

Merging #237 (fb1aa78) into main (3dabc30) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #237   +/-   ##
=======================================
  Coverage   73.65%   73.65%           
=======================================
  Files          21       21           
  Lines         911      911           
  Branches      227      221    -6     
=======================================
  Hits          671      671           
  Misses        238      238           
  Partials        2        2           

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