chore: Update another action to Node24 (#6703)

.github/workflows/test-cli-ui_oss.yml

@@ -111,7 +111,7 @@ jobs:
           make -C internal/tests/cli test-vault-down
       - name: Send Slack message
         if: ${{ failure() }}
-        uses: slackapi/slack-github-action@91efab103c0de0a537f72a35f6b8cda0ee76bf0a # v2.1.1
+        uses: slackapi/slack-github-action@45a88b9581bfab2566dc881e2cd66d334e621e2c # v3.0.3
         with:
           method: chat.postMessage
           token: ${{ secrets.SLACK_BOUNDARY_TEST_BOT_TOKEN }}