CI: fix DOCS workflow

Author: leecannon

.github/workflows/DOCS.yml

@@ -32,9 +32,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
-      - uses: mlugg/setup-zig@v1
-        with:
-          version: master
+      - uses: mlugg/setup-zig@v2
 
       - name: Build docs
         run: zig build docs