ci: Install script dependencies before detecting new packages (backport to 1.x) (#28114)

Co-authored-by: Matsu <huhta.matias@gmail.com>

Author: n8n-assistant[bot]

.github/workflows/release-publish.yml

@@ -58,6 +58,9 @@ jobs:
           N8N_FAIL_ON_POPULARITY_FETCH_ERROR: true
           SENTRY_AUTH_TOKEN: ${{ secrets.SENTRY_AUTH_TOKEN }}
 
+      - name: Install script dependencies
+        run: pnpm install --frozen-lockfile --dir ./.github/scripts --ignore-workspace
+
       - name: Check for new unpublished packages
         run: node .github/scripts/detect-new-packages.mjs