Switch to thiserror instead of thiserror-no-std

[r-n-o]

I'm wondering why this library chose to depend on thiserror-no-std:

vsss-rs/Cargo.toml

Line 38 in c6e746d

thiserror-no-std = "2.0"

thiserror-no-std isn't owned by dtolnay so I don't know how trustworthy it is: https://crates.io/crates/thiserror-no-std

If there are no pushback I'd like to make a PR to switch to thiserror directly (with default-features=false, to be no-std friendly). What do you think?