koto: use finalAttrs pattern

pkgs/by-name/ko/koto/package.nix

@@ -7,14 +7,14 @@
   nix-update-script,
 }:
 
-rustPlatform.buildRustPackage rec {
+rustPlatform.buildRustPackage (finalAttrs: {
   pname = "koto";
   version = "0.15.2";
 
   src = fetchFromGitHub {
     owner = "koto-lang";
     repo = "koto";
-    tag = "v${version}";
+    tag = "v${finalAttrs.version}";
     hash = "sha256-T8SjNeoTANAcT+uAdgzBRMK0LbC038cpKFoCFHgsp8k=";
   };
 
@@ -36,9 +36,9 @@ rustPlatform.buildRustPackage rec {
   meta = {
     description = "Simple, expressive, embeddable programming language";
     homepage = "https://github.com/koto-lang/koto";
-    changelog = "https://github.com/koto-lang/koto/blob/${src.rev}/CHANGELOG.md";
+    changelog = "https://github.com/koto-lang/koto/blob/${finalAttrs.src.rev}/CHANGELOG.md";
     license = lib.licenses.mit;
     maintainers = with lib.maintainers; [ defelo ];
     mainProgram = "koto";
   };
-}
+})