Updates plantuml.jar to v1.2024.8

[TecnoSigma]

Hi,

I use your plugin with many frequency. It is great!

But, I verified that the file plantuml.jar is outdated.

See more information:

https://github.com/plantuml/plantuml/blob/master/CHANGES.md

Thanks and continue contribuing to the opensource community... Always! 😃

[boldandbusted]

I'd love to see another bump to the current version of PlantUML, or just allow another plantuml.jar be used if it is in the $PATH. Cheers.