fix nvidia error from prior nix flake update (#224)

Author: jaysa68

flake.lock

@@ -1,6 +1,13 @@
-{ cosmic-greeter }:
+{ cosmic-greeter, rustPlatform }:
 
-cosmic-greeter.overrideAttrs {
+# Re-vendor cargo deps since upstream cargoHash is stale
+# Remove cargoDeps override after `nix flake update` if build succeeds without it
+# https://discourse.nixos.org/t/overriding-version-cant-find-new-cargohash/31502/10
+cosmic-greeter.overrideAttrs (oldAttrs: {
   patches = [ ./ocf-cosmic-greeter/add-logout-button.patch ];
-}
+  cargoDeps = rustPlatform.fetchCargoVendor {
+    inherit (oldAttrs) src;
+    hash = "sha256-4yRBgFrH4RBpuvChTED+ynx+PyFumoT2Z+R1gXxF4Xc=";
+  };
+})