Garbage collect HeadlessMc

[3arthqu4ke]

Micro-Optimization, was not really worth it.

Only worth it when a fresh instance of Mc is started, in that case all the library/asset downloading threads seem to fill up the memory?

[github-actions]

Overall Project	71.49% -0.42%	🍏
Files changed	36.4%	❌

File	Coverage
Main.java	96.45% -1.42%	🍏
Main.java	86.84% -10.53%	🍏
AbstractLaunchProcessLifecycle.java	68.47% -7.01%	❌
ProcessThread.java	17.09% -82.91%	❌

[github-actions]

Overall Project	71.48% -0.42%	🍏
Files changed	35.97%	❌

File	Coverage
Main.java	96.45% -1.42%	🍏
Main.java	86.84% -10.53%	🍏
AbstractLaunchProcessLifecycle.java	68.17% -7.41%	❌
ProcessThread.java	17.09% -82.91%	❌