fix: upgrade to setup-zig@v2 with Zig 0.15.2

v1 had issues with the tarball naming convention for Zig 0.15.x.
v2.1.0 (released Nov 28, 2025) fixes ARM support and recent Zig versions.

Author: subtleGradient

.github/workflows/release.yml

@@ -22,9 +22,9 @@ jobs:
       - uses: actions/checkout@v4
 
       - name: Install Zig
-        uses: mlugg/setup-zig@v1
+        uses: mlugg/setup-zig@v2
         with:
-          version: 0.14.0
+          version: 0.15.2
 
       - name: Build all platforms
         run: |