Support upx for Better Binary Size Minify

[SamuNatsu]

Just like it: https://github.com/johnthagen/min-sized-rust?tab=readme-ov-file#compress-the-binary

UPX repository is here: https://github.com/upx/upx

[autarch]

From some quick testing with my own omegasort project, this produces an impressive c. 75% reduction in binary size. I'm definitely open to adding this as an option to this action.

[autarch]

I've been thinking about this a bit, and I realized that this really doesn't belong in this action. This seems like something that should happen at the release step. It's already a bit odd that this action has a strip input (which I plan to get rid of in favor of letting cargo do this - #41).

I have another action, actions-rust-release, where this would make more sense. But I'm also wondering what the future of that action should be - houseabsolute/actions-rust-release#10