Fix Slack notif 2

Author: CharlesDuboisSAP

.github/workflows/spec-update.yaml

@@ -252,7 +252,7 @@ jobs:
           exit 1
 
       - name: "Slack Notification"
-        if: failure() && github.event.inputs.create-pr == true
+        if: ${{ failure() && github.event.inputs.create-pr == true }}
         uses: slackapi/slack-github-action@v2.1.1
         with:
           webhook: ${{ secrets.SLACK_WEBHOOK }}