update zon2nix

Upstream is now mostly pure Zig and the build.zig.zon.* files are
generated directly by zon2nix. The JSON file is no longer used as an
intermediate file but is retained for downstream packager usage.

flake.lock

@@ -36,11 +36,11 @@
     },
     "nixpkgs-stable": {
       "locked": {
-        "lastModified": 1738255539,
-        "narHash": "sha256-hP2eOqhIO/OILW+3moNWO4GtdJFYCqAe9yJZgvlCoDQ=",
+        "lastModified": 1741992157,
+        "narHash": "sha256-nlIfTsTrMSksEJc1f7YexXiPVuzD1gOfeN1ggwZyUoc=",
         "owner": "nixos",
         "repo": "nixpkgs",
-        "rev": "c3511a3b53b482aa7547c9d1626fd7310c1de1c5",
+        "rev": "da4b122f63095ca1199bd4d526f9e26426697689",
         "type": "github"
       },
       "original": {
@@ -52,11 +52,11 @@
     },
     "nixpkgs-unstable": {
       "locked": {
-        "lastModified": 1741708242,
-        "narHash": "sha256-cNRqdQD4sZpN7JLqxVOze4+WsWTmv2DGH0wNCOVwrWc=",
+        "lastModified": 1741865919,
+        "narHash": "sha256-4thdbnP6dlbdq+qZWTsm4ffAwoS8Tiq1YResB+RP6WE=",
         "owner": "nixos",
         "repo": "nixpkgs",
-        "rev": "b62d2a95c72fb068aecd374a7262b37ed92df82b",
+        "rev": "573c650e8a14b2faa0041645ab18aed7e60f0c9a",
         "type": "github"
       },
       "original": {
@@ -73,7 +73,7 @@
         "nixpkgs-stable": "nixpkgs-stable",
         "nixpkgs-unstable": "nixpkgs-unstable",
         "zig": "zig",
-        "zig2nix": "zig2nix"
+        "zon2nix": "zon2nix"
       }
     },
     "systems": {
@@ -102,11 +102,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1741702955,
-        "narHash": "sha256-Emk3VnNByigCBlBN34IH2cMrsUqIhdex02uw9TSDsN0=",
+        "lastModified": 1741825901,
+        "narHash": "sha256-aeopo+aXg5I2IksOPFN79usw7AeimH1+tjfuMzJHFdk=",
         "owner": "mitchellh",
         "repo": "zig-overlay",
-        "rev": "1152ce759114a94134081270affd970ae1b957ed",
+        "rev": "0b14285e283f5a747f372fb2931835dd937c4383",
         "type": "github"
       },
       "original": {
@@ -115,7 +115,7 @@
         "type": "github"
       }
     },
-    "zig2nix": {
+    "zon2nix": {
       "inputs": {
         "flake-utils": [
           "flake-utils"
@@ -125,17 +125,17 @@
         ]
       },
       "locked": {
-        "lastModified": 1741816255,
-        "narHash": "sha256-SJQMnm1vwXy8Td2qp/omjybn+4xZ/MDdZHeK6aa2nb0=",
+        "lastModified": 1742104771,
+        "narHash": "sha256-LhidlyEA9MP8jGe1rEnyjGFCzLLgCdDpYeWggibayr0=",
         "owner": "jcollie",
-        "repo": "zig2nix",
-        "rev": "c2a24405298373123e12ca81805e436da648aaf5",
+        "repo": "zon2nix",
+        "rev": "56c159be489cc6c0e73c3930bd908ddc6fe89613",
         "type": "github"
       },
       "original": {
         "owner": "jcollie",
-        "ref": "c2a24405298373123e12ca81805e436da648aaf5",
-        "repo": "zig2nix",
+        "ref": "56c159be489cc6c0e73c3930bd908ddc6fe89613",
+        "repo": "zon2nix",
         "type": "github"
       }
     }