rs: Update rust version

Update Cargo.lock and nixpkgs to support current stable rust releases.
We need to update as upgrading rustc past v1.77 changes the syntax used
in for the lockfile.

Changelog-None

Signed-off-by: Peter Neuroth <[email protected]>

Author: nepet

Cargo.lock

@@ -2,7 +2,7 @@
   description = "Core Lightning (CLN): A specification compliant Lightning Network implementation in C";
 
   inputs = {
-    nixpkgs.url = "github:NixOS/nixpkgs/nixos-24.05";
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-24.11";
 
     flake-parts.url = "github:hercules-ci/flake-parts";