build(deps): Bump rtCamp/action-slack-notify from 2.3.0 to 2.3.1

Bumps [rtCamp/action-slack-notify](https://github.com/rtcamp/action-slack-notify) from 2.3.0 to 2.3.1.
- [Release notes](https://github.com/rtcamp/action-slack-notify/releases)
- [Commits](rtCamp/action-slack-notify@v2.3.0...v2.3.1)

---
updated-dependencies:
- dependency-name: rtCamp/action-slack-notify
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/pr-reminder.yml

@@ -36,7 +36,7 @@ jobs:
             return table;
       - name: Send Slack Reminder
         if: steps.pr-list.outputs.result != ''
-        uses: rtCamp/action-slack-notify@v2.3.0
+        uses: rtCamp/action-slack-notify@v2.3.1
         env:
           SLACK_WEBHOOK: ${{ secrets.SLACK_WEBHOOK }}
           SLACK_CHANNEL: pr-github