[bug#64804] [PATCH 5/5] gnu: rust: Update to 1.71.

[Fries]

git-send-email wouldn't let me make a cover letter as the teams script thought 
it was an invalid patch so i'm going to send this email here.

this patch series updates the rust package to rust 1.71.0! this means programs 
that require newer std api's like the stablized OnceCell API that was added in 
rust 1.70 can be used! i submitted this patch before and i got some feedback 
from juliana so i split my patches into a patch series. 

i don't know what branch this should go in but i checked the submitting patch 
webpage and i think as a rust update would mean a lot of rebuilding, i think 
it should go into the core-updates branch but i see theres also a rust-team 
branch. i don't know which one would be optimal.