shell.nix needs an update

[thinkrapido]

nix-shell
building '/nix/store/6v09s03banh05w89rx34z6d13hndvf9i-channel-rust-stable.toml.drv'...

trying https://static.rust-lang.org/dist/channel-rust-stable.toml
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 703k 100 703k 0 0 4628k 0 --:--:-- --:--:-- --:--:-- 4628k
error: hash mismatch in fixed-output derivation '/nix/store/6v09s03banh05w89rx34z6d13hndvf9i-channel-rust-stable.toml.drv':
specified: sha256-2NfCJiH3wk7sR1XlRf8+IZfY3S9sYKdL8TpMqk82Bq0=
got: sha256-KXx+ID0y4mg2B3LHp7IyaiMrdexF6octADnAtFIOjrY=
(use '--show-trace' to show detailed location information)