Switch rust-overlay to FlakeHub input

Author: lucperkins

flake.lock

@@ -2,7 +2,7 @@
   inputs = {
     nixpkgs.url = "https://flakehub.com/f/NixOS/nixpkgs/0.2405.*";
     rust-overlay = {
-      url = "github:oxalica/rust-overlay";
+      url = "https://flakehub.com/f/oxalica/rust-overlay/*";
       inputs.nixpkgs.follows = "nixpkgs";
     };
     crane.url = "https://flakehub.com/f/ipetkov/crane/0.19.*";