[bug#64804] [PATCH] gnu: rust: Update to Rust 1.71.0

[jaeme]

Also bump,

We shouldn't be 4 versions behind upstream as a lot of newer rust 
apps/programs require on what used to be unstable features in 
older/current versions of rust. This is currently a stopgap for me when 
packaging swww, a wayland compositor wallpaper changer.


Thanks all.