Update nixpkgs digest to 4694fa6 (#54)

Co-authored-by: Renovate Bot <renovate@whitesourcesoftware.com>

Author: SuperSandroBot

fixx/derivation.nix

@@ -1,10 +1,25 @@
-{ lib, rustPlatform, binaryen, rustc, wasm-pack, wasm-bindgen-cli }:
+{ lib
+, buildWasmBindgenCli
+, rustPlatform
+, binaryen
+, fetchCrate
+, rustc
+, wasm-pack
+}:
 
 let
-  wasm-bindgen-100 = wasm-bindgen-cli.override {
-    version = "0.2.100";
-    hash = "sha256-3RJzK7mkYFrs7C/WkhW9Rr4LdP5ofb2FdYGz1P7Uxog=";
-    cargoHash = "sha256-tD0OY2PounRqsRiFh8Js5nyknQ809ZcHMvCOLrvYHRE=";
+  wasm-bindgen-100 = buildWasmBindgenCli rec {
+    src = fetchCrate {
+      pname = "wasm-bindgen-cli";
+      version = "0.2.100";
+      hash = "sha256-3RJzK7mkYFrs7C/WkhW9Rr4LdP5ofb2FdYGz1P7Uxog=";
+    };
+
+    cargoDeps = rustPlatform.fetchCargoVendor {
+      inherit src;
+      inherit (src) pname version;
+      hash = "sha256-qsO12332HSjWCVKtf1cUePWWb9IdYUmT+8OPj/XP2WE=";
+    };
   };
   manifest = (lib.importTOML ./Cargo.toml).package;
 in