fix: change the rust tool chain in shell.nix
from stable to nightly
#314
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The rustfmt.toml rules are only supported by rust nightly. With the current stable rust tool chain in flake.nix,
cargo fmt
gives me warnings likeThe format result with those warnings is different from the current code base for almost all files. I guess the main contributors of the repo use nightly rust. If so, we should make it consistent in shell.nix to help other contributors onboard with the same env.