add slack notification action

Author: UrazAkgultan

.github/actions/slack-notification/action.yml

@@ -16,12 +16,10 @@ runs:
   using: "composite"
   steps:
     - name: Send Slack notification
-      uses: slackapi/slack-github-action@v1.25.0
+      uses: slackapi/slack-github-action@485a9d42d3a73031f12ec201c457e2162c45d02d # v2
       with:
         method: chat.postMessage
         token: ${{ inputs.bot-token }}
         payload: |
-          {
-            "channel": "${{ inputs.channel-id }}",
-            "text": "${{ inputs.message }}"
-          }
+          channel: ${{ inputs.channel-id }}
+          text: ${{ inputs.message }}