chore(deps): update slackapi/slack-github-action action to v1.26.0

Author: renovate[bot]

.github/workflows/test-e2e.yml

@@ -249,7 +249,7 @@ jobs:
           path: report/test-results.json
       - name: Notify Slack
         if: success() || failure()
-        uses: slackapi/slack-github-action@v1.24.0
+        uses: slackapi/slack-github-action@v1.26.0
         env:
           SLACK_WEBHOOK_URL: ${{ secrets.SLACK_WEBHOOK_URL }}
           SLACK_WEBHOOK_TYPE: INCOMING_WEBHOOK