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/raw-api.yml

@@ -21,9 +21,9 @@ jobs:
         runs-on: ubuntu-latest
 
         steps:
-            - uses: actions/checkout@v6
+            - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
 
-            - uses: actions/setup-node@v6
+            - uses: actions/setup-node@48b55a011bda9f5d6aeb4c2d9c7362e8dae4041e # v6.4.0
               with:
                   node-version: 20.x