Change minimum Rust toolchain to 1.77

[sebastiencs]

Use Rust 1.77, to be able to use the now stable array::each_ref instead of array::from_fn.

each_ref guarantee that the source and destination have the same length.
That will protect us from length mismatch in future refactoring, or when binprot types are updated

[tizoc]

LGTM. When this gets merged to develop please notify everybody about the new minimum required version.

[dkuehr]

Looks much better than the previous approach.
Btw, did you notice any speedup? (I suspect not much since in many cases the array elements are the same size as a reference)

[sebastiencs]

Btw, did you notice any speedup? (I suspect not much since in many cases the array elements are the same size as a reference)

I didn't see any changes on performances. The arrays we're working with are probably not big enough