Update Rust + Nix environment.

Author: brocaar

rust-toolchain.toml

@@ -1,4 +1,4 @@
 [toolchain]
-channel = "1.74.0"
+channel = "1.77.1"
 components = ["rustfmt", "clippy"]
 profile = "default"

shell.nix

@@ -1,9 +1,9 @@
-{ pkgs ? import (fetchTarball "https://github.com/NixOS/nixpkgs/archive/nixos-23.05.tar.gz") {} }:
+{ pkgs ? import (fetchTarball "https://github.com/NixOS/nixpkgs/archive/nixos-23.11.tar.gz") {} }:
 
 pkgs.mkShell {
   buildInputs = [
     pkgs.cacert
     pkgs.rustup
     pkgs.protobuf
   ];
-}
+}