Update Zig setup action to version 2

Author: basicer

.github/workflows/ci.yml

@@ -30,7 +30,7 @@ jobs:
           submodules: false
 
       - name: Set up Zig
-        uses: mlugg/setup-zig@v1
+        uses: mlugg/setup-zig@v2
         with:
           version: ${{ matrix.zig-version }}
           use-cache: false