fix(voip/mumble): Voice cracking on high load

[Ktos93]

Goal of this PR

Fix voice cracking on high load

How is this PR achieving the goal

Setting a higher thread priority for Mumble voice. These changes need to be tested on Canary; I can't see any other way to conduct large-scale tests. I tried to create this issue using two RedM clients and running a CPU stress test in the background, but there was no way to replicate this on my PC and my friend's PC.

This PR applies to the following area(s)

FiveM, RedM

Successfully tested on

Game builds: 1491

Platforms: Windows

Checklist

• [x] Code compiles and has been tested successfully.
• [x] Code explains itself well and/or is documented.
• [x] My commit message explains what the changes do and what they are for.
• [x] No extra compilation warnings are added by these changes.

Fixes issues

fixes #2742