chore(gha): bump slackapi/slack-github-action from 2.0.0 to 2.1.0 (#410)

Author: dependabot[bot]

.github/workflows/slack-send-message.yml

@@ -17,7 +17,7 @@ jobs:
       SLACK_CHANNEL: ${{ inputs.channel-or-user }} # sanitize user inputs
     steps:
       - name: Send message to Slack
-        uses: slackapi/slack-github-action@v2.0.0
+        uses: slackapi/slack-github-action@v2.1.0
         with:
           errors: true
           method: chat.postMessage