ci: bump slackapi/slack-github-action from 1.26 to 1.27 (#193)

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/draft-pr-converter.yml

@@ -77,7 +77,7 @@ jobs:
       - name: Post to a Slack channel
         id: slack
         if: ${{ steps.mutation_step.outputs.exec == 'true' }}
-        uses: slackapi/slack-github-action@v1.26
+        uses: slackapi/slack-github-action@v1.27
         with:
           channel-id: 'C02LMULF4NA'
           payload: '{ "type": "mrkdwn", "text": "${{ env.SLACK_MESSAGE }}" }'