Remove discretionary ligatures, hex back to hex-low

Update nixpkgs

custom-build-plan.nix

@@ -1,7 +1,6 @@
 {
   noCvSs = false;
   exportGlyphNames = false;
-  ligations.inherits = "dlig";
   weights = {
     Regular = {
       shape = 400;
@@ -53,7 +52,7 @@
     seven = "bend-serifless-crossbar";
     eight = "two-circles";
     nine = "open-contour";
-    asterisk = "hex-high";
+    asterisk = "hex-low";
     underscore = "high";
     caret = "high";
     paren = "normal";

flake.lock

@@ -2,11 +2,11 @@
   "nodes": {
     "nixpkgs": {
       "locked": {
-        "lastModified": 1726937504,
-        "narHash": "sha256-bvGoiQBvponpZh8ClUcmJ6QnsNKw0EMrCQJARK3bI1c=",
+        "lastModified": 1728888510,
+        "narHash": "sha256-nsNdSldaAyu6PE3YUA+YQLqUDJh+gRbBooMMekZJwvI=",
         "owner": "nixos",
         "repo": "nixpkgs",
-        "rev": "9357f4f23713673f310988025d9dc261c20e70c6",
+        "rev": "a3c0b3b21515f74fd2665903d4ce6bc4dc81c77c",
         "type": "github"
       },
       "original": {