workflows: use 0.13 here too.

Author: kivikakk

.github/workflows/zig.yml

@@ -29,7 +29,7 @@ jobs:
       - uses: actions/checkout@v4
       - uses: goto-bus-stop/setup-zig@v2
         with:
-          version: 0.12.0
+          version: 0.13.0
       - run: zig build
       - run: zig build test
   lint: