zile: refactor to use finalAttrs

- wrap derivation in `stdenv.mkDerivation (finalAttrs: { ... })`
- replace `${pname}`/`${version}` with `${finalAttrs.version}` in `src` URL
- update `meta.changelog` to interpolate `finalAttrs.version`
- hardcode pname value in `src` URL

This removes reliance on `rec` and ensures attribute references are
scoped through `finalAttrs`, aligning with current Nixpkgs conventions.

pkgs/by-name/zi/zile/package.nix

···
   vala,
 }:
 
-stdenv.mkDerivation rec {
+stdenv.mkDerivation (finalAttrs: {
   pname = "zile";
   version = "2.6.4";
 
   src = fetchurl {
-    url = "mirror://gnu/zile/${pname}-${version}.tar.gz";
+    url = "mirror://gnu/zile/zile-${finalAttrs.version}.tar.gz";
     hash = "sha256-1dRLhctJBkPQcH4aIYbzoymYwvbquqlIFHm2XK7uV8A=";
   };
 
···
 
   meta = {
     homepage = "https://www.gnu.org/software/zile/";
-    changelog = "https://git.savannah.gnu.org/cgit/zile.git/plain/NEWS?h=v${version}";
+    changelog = "https://git.savannah.gnu.org/cgit/zile.git/plain/NEWS?h=v${finalAttrs.version}";
     description = "Implements Lua Editors";
     longDescription = ''
       GNU Zile is a text editor development kit, so that you can (relatively)
···
     platforms = lib.platforms.unix;
     mainProgram = "zile";
   };
-}
+})