upgrade setup-zig

Author: hazeycode

.github/workflows/main.yml

@@ -20,15 +20,8 @@ jobs:
     steps:
       - name: Checkout repository
         uses: actions/checkout@v3
-      - name: Read .zig-version
-        id: zigversion
-        uses: juliangruber/read-file-action@v1
-        with:
-          path: ./.zigversion
       - name: Install Zig
-        uses: mlugg/setup-zig@v1
-        with:
-          version: ${{ steps.zigversion.outputs.content }}
+        uses: mlugg/setup-zig@v2
       - name: Check format
         continue-on-error: true
         run: zig fmt --check .