i3lock: modernize derivation

pkgs/by-name/i3/i3lock/package.nix

@@ -22,15 +22,15 @@ let
     xcbSupport = true;
   };
 in
-stdenv.mkDerivation rec {
+stdenv.mkDerivation (finalAttrs: {
   pname = "i3lock";
   version = "2.15";
 
   src = fetchFromGitHub {
     owner = "i3";
     repo = "i3lock";
-    rev = version;
-    sha256 = "sha256-OyV6GSLnNV3GUqrfs3OBnIaBvicH2PXgeY4acOk5dR4=";
+    tag = finalAttrs.version;
+    hash = "sha256-OyV6GSLnNV3GUqrfs3OBnIaBvicH2PXgeY4acOk5dR4=";
   };
 
   separateDebugInfo = true;
@@ -69,4 +69,4 @@ stdenv.mkDerivation rec {
     platforms = lib.platforms.all;
   };
 
-}
+})