ci(workflows): pin github actions to commit hashes

Updated all GitHub Actions dependencies across workflows to use full commit SHAs instead of mutable version tags (e.g., `actions/checkout`, `actions/setup-node`, and `actions/stale`). This hardens the CI/CD pipeline by ensuring action dependencies are strictly immutable and prevents potential supply chain attacks.

.github/workflows/publish.yml

@@ -19,7 +19,7 @@ jobs:
         name: DNS
         runs-on: ubuntu-latest
         steps:
-            - uses: actions/checkout@v6
+            - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
 
             - name: Generate creds.json
               run: echo '{"cloudflare":{"TYPE":"CLOUDFLAREAPI","apitoken":"$CLOUDFLARE_API_TOKEN"}}' > ./creds.json