🛡️ Sentinel: Fix CI failures and update dependencies

- Resolved the GitHub Actions CI deprecation warning by upgrading checkout/setup-python actions to support Node.js 24 (`v4.2.2` and `v5.4.0` respectively).
- Addressed the `pip-audit` failure (CVE-2026-4750) triggered by the malicious `fastar` dependency injection in `fastapi==0.136.3` by explicitly blocking that version (`fastapi[all]!=0.136.3`) in `requirements.txt`.

Co-authored-by: christianlouis <361235+christianlouis@users.noreply.github.com>

.github/workflows/release.yml

@@ -23,13 +23,13 @@ jobs:
 
     steps:
       - name: Checkout Code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v4.2.2
         with:
           fetch-depth: 0
           token: ${{ secrets.GITHUB_TOKEN }}
 
       - name: Set up Python
-        uses: actions/setup-python@v5
+        uses: actions/setup-python@v5.4.0
         with:
           python-version: '3.11'
           cache: 'pip'