Pin GitHub Actions to full commit SHAs in publish workflow

Fix workflow failure caused by repository policy requiring actions
to be pinned to full-length commit SHAs instead of version tags.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: mikolalysenko

.github/workflows/publish.yml

@@ -34,10 +34,10 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
 
       - name: Setup Node.js
-        uses: actions/setup-node@v4
+        uses: actions/setup-node@49933ea5288caeca8642d1e84afbd3f7d6820020 # v4
         with:
           node-version: '20'