Bring back Slack notification step

Author: artembilan

.github/workflows/spring-finalize-release.yml

@@ -45,13 +45,13 @@ jobs:
             gh api -X PATCH repos/$GITHUB_REPOSITORY/milestones/$MILESTONE_ID -f state='closed' --silent
           fi
 
-#      - name: Announce Release on Slack
-#        uses: slackapi/slack-github-action@v1.24.0
-#        env:
-#          SLACK_WEBHOOK_URL: ${{ secrets.SPRING_RELEASE_SLACK_WEBHOOK_URL }}
-#          SLACK_WEBHOOK_TYPE: INCOMING_WEBHOOK
-#        with:
-#          payload: |
-#            {
-#              "text": "${{ github.event.repository.name }}-announcing `${{ env.MILESTONE }}`"
-#            }
+      - name: Announce Release on Slack
+        uses: slackapi/slack-github-action@v1.24.0
+        env:
+          SLACK_WEBHOOK_URL: ${{ secrets.SPRING_RELEASE_SLACK_WEBHOOK_URL }}
+          SLACK_WEBHOOK_TYPE: INCOMING_WEBHOOK
+        with:
+          payload: |
+            {
+              "text": "${{ github.event.repository.name }}-announcing `${{ env.MILESTONE }}`"
+            }