Fix compilation on latest nightly because of stdsimd (#3296)

We need to bump `ahash` to make it compile again.

Closes: https://github.com/paritytech/polkadot-sdk/issues/3269

substrate/bin/node-template/env-setup/flake.nix

@@ -0,0 +1,22 @@
+{
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+    flake-utils.url = "github:numtide/flake-utils";
+  };
+
+  outputs = { self, nixpkgs, flake-utils, ... }: flake-utils.lib.eachDefaultSystem (system:
+    let
+      pkgs = import nixpkgs { inherit system; };
+    in
+    {
+      devShells.default = pkgs.mkShell {
+        packages = with pkgs; [
+          rustup
+          clang
+          protobuf
+        ];
+
+        LIBCLANG_PATH = "${pkgs.libclang.lib}/lib";
+      };
+    });
+}