deps: update z2d to v0.8.0 (ghostty-org#8566)

Release notes at:
  https://github.com/vancluever/z2d/blob/v0.8.0/CHANGELOG.md

This is a small update and likely contains nothing related to Ghostty,
but I wanted to make sure it got in before the 1.2.0 release since it
contains the removal of non-functional code that wasn't compiling, just
for correctness' sake.

Also if for some reason ARGB/XRGB is needed for some utility purpose,
it's there now. 🙂

Author: mitchellh

build.zig.zon

@@ -20,8 +20,8 @@
         },
         .z2d = .{
             // vancluever/z2d
-            .url = "https://github.com/vancluever/z2d/archive/refs/tags/v0.7.2.tar.gz",
-            .hash = "z2d-0.7.2-j5P_Hm1oDQDQsWpGfSCMARhowBnuTHlQ_sBfij6TuG7l",
+            .url = "https://github.com/vancluever/z2d/archive/refs/tags/v0.8.0.tar.gz",
+            .hash = "z2d-0.8.0-j5P_HgW8DQBvCefcGWPZA1WC5Nco08WhKjG3XCW3thMr",
             .lazy = true,
         },
         .zig_objc = .{

build.zig.zon.json

@@ -157,9 +157,9 @@
   },
   {
     "type": "archive",
-    "url": "https://github.com/vancluever/z2d/archive/refs/tags/v0.7.2.tar.gz",
-    "dest": "vendor/p/z2d-0.7.2-j5P_Hm1oDQDQsWpGfSCMARhowBnuTHlQ_sBfij6TuG7l",
-    "sha256": "b56acb944394e3fd193a5ce018e5c1d3c7d6eeca9fc8015fdeb96fd3097d6ff7"
+    "url": "https://github.com/vancluever/z2d/archive/refs/tags/v0.8.0.tar.gz",
+    "dest": "vendor/p/z2d-0.8.0-j5P_HgW8DQBvCefcGWPZA1WC5Nco08WhKjG3XCW3thMr",
+    "sha256": "d3247961ce4cc4e24157572fe0b3960705a4658706539dea159778d139593dc8"
   },
   {
     "type": "archive",