update mlugg/setup-zig in lint

Author: kassane

.github/workflows/CI.yml

@@ -23,5 +23,5 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
-      - uses: mlugg/setup-zig@v1
+      - uses: mlugg/setup-zig@v2
       - run: zig fmt --check --ast-check */*.zig