Update workflow

Author: nihklas

.github/workflows/ci.yaml

@@ -23,7 +23,7 @@ jobs:
           sudo apt-get install -y lld llvm llvm-dev clang
 
       - name: Set up Zig
-        uses: mlugg/setup-zig@v1
+        uses: mlugg/setup-zig@v2
 
       - name: Run `build`
         run: zig build