verilator: 5.038 -> 5.040 (#441650)

pkgs/by-name/ve/verilator/package.nix

···
 
 stdenv.mkDerivation rec {
   pname = "verilator";
-  version = "5.038";
+  version = "5.040";
 
   # Verilator gets the version from this environment variable
   # if it can't do git describe while building.
···
   src = fetchFromGitHub {
     owner = "verilator";
     repo = "verilator";
-    rev = "v${version}";
-    hash = "sha256-uPGVE7y3zm+5ZydGjd1+/kIjW+a5u6d+YzjUSE4KnCY=";
+    tag = "v${version}";
+    hash = "sha256-S+cDnKOTPjLw+sNmWL3+Ay6+UM8poMadkyPSGd3hgnc=";
   };
 
   enableParallelBuilding = true;
···
   };
 
   meta = with lib; {
+    changelog = "https://github.com/verilator/verilator/blob/${src.tag}/Changes";
     description = "Fast and robust (System)Verilog simulator/compiler and linter";
     homepage = "https://www.veripool.org/verilator";
     license = with licenses; [