chore: update slack action

.github/workflows/ci.yml

@@ -190,6 +190,18 @@ jobs:
         with:
           args: "Error running `deploy-staging` job in OpenAPI CI"
 
+      - name: Send Slack notification
+        uses: slackapi/[email protected]
+        with:
+          payload: |
+            {
+              "text": "**new gha**\nPushed latest OpenAPI changes to `en-staging` branch :rocket:",
+              "icon_url": "https://avatars3.githubusercontent.com/u/8659759?s=200&v=4",
+              "username": "GitHub Actions"
+            }
+        env:
+          SLACK_WEBHOOK: ${{ secrets.SLACK_WEBHOOK }}
+
   # Build the OpenAPI spec and validate using Codegen
   validate-spec:
     name: Validate OpenAPI spec using Codegen