ci: use zig 0.14 on macos too

Author: lun-4

.github/workflows/github-actions-demo.yml

@@ -20,7 +20,7 @@ jobs:
       - uses: actions/checkout@v3
       - uses: mlugg/setup-zig@v1
         with:
-          version: 0.13.0
+          version: 0.14.0
       - run: |
           brew update
           brew install gettext