Update mlugg/setup-zig step in build workflow

Author: mpfaff

.github/workflows/build.yml

@@ -39,9 +39,7 @@ jobs:
               with:
                   packages: b3sum
                   version: 1.0
-            - uses: mlugg/setup-zig@v1
-              with:
-                version: 0.15.0-dev.1092+d772c0627
+            - uses: mlugg/setup-zig@v2
             - name: "Build"
               run: |
                   zig build build-all -Doptimize=$OPTIMIZE