Add ReturnTypeWillChange annotation to fix deprecation warnings

[tachigami]

A quick fix for the deprecation warnings that spam a log.

I hope as it is only an annotation change it will be merged soon.

[zayec]

@rez1dent3 Hi Max! can you merge it, please! :)

[rez1dent3]

@zayec Hi. I would love to help, but I don't have the rights. This is not my project.

[zayec]

Thanks Max :) I will try to tag the rest of contributors :) @FacedSID @evsign @tachigami Guys, maybe you can help :pray: