php.extensions.pcov: update `src` attribute

So it can be automatically updated with `nix-update`

pkgs/development/php-packages/pcov/default.nix

···
-{ buildPecl, lib, pcre2 }:
+{ buildPecl, lib, php, pcre2, fetchFromGitHub }:
 
-buildPecl {
+let
+  version = "1.0.11";
+in buildPecl {
+  inherit version;
   pname = "pcov";
 
-  version = "1.0.11";
-  sha256 = "sha256-rSLmTNOvBlMwGCrBQsHDq0Dek0SCzUAPi9dgZBMKwkI=";
+  src = fetchFromGitHub {
+    owner = "krakjoe";
+    repo = "pcov";
+    rev = "v${version}";
+    sha256 = "sha256-lyY17Y9chpTO8oeWmDGSh0YSnipYqCuy1qmn9su5Eu8=";
+  };
 
   buildInputs = [ pcre2 ];
 
   meta = with lib; {
+    changelog = "https://github.com/krakjoe/pcov/releases/tag/v${version}";
     description = "A self contained php-code-coverage compatible driver for PHP.";
     license = licenses.php301;
     homepage = "https://github.com/krakjoe/pcov";