as31: modernize

- replace `rec` with `finalAttrs`
- remove `with lib;` from `meta`

pkgs/by-name/as/as31/package.nix

@@ -6,13 +6,13 @@
   bison,
 }:
 
-stdenv.mkDerivation rec {
+stdenv.mkDerivation (finalAttrs: {
   pname = "as31";
   version = "2.3.1";
 
   src = fetchurl {
-    url = "mirror://debian/pool/main/a/as31/${pname}_${version}.orig.tar.gz";
-    name = "${pname}-${version}.tar.gz";
+    url = "mirror://debian/pool/main/a/as31/${finalAttrs.pname}_${finalAttrs.version}.orig.tar.gz";
+    name = "${finalAttrs.pname}-${finalAttrs.version}.tar.gz";
     hash = "sha256-zSEyWHFon5nyq717Mpmdv1XZ5Hz0e8ZABqsP8M83c1U=";
   };
 
@@ -41,12 +41,12 @@ stdenv.mkDerivation rec {
     bison
   ];
 
-  meta = with lib; {
+  meta = {
     homepage = "https://www.pjrc.com/tech/8051/tools/as31-doc.html";
     description = "8031/8051 assembler";
     mainProgram = "as31";
-    license = licenses.gpl2Plus;
-    maintainers = with maintainers; [ ];
-    platforms = platforms.unix;
+    license = lib.licenses.gpl2Plus;
+    maintainers = [ ];
+    platforms = lib.platforms.unix;
   };
-}
+})