Merge pull request #567 from salesforcecli/update-gha

Update GHA actions

Author: shetzel

.github/workflows/failureNotifications.yml

@@ -12,7 +12,7 @@ jobs:
     steps:
       - name: Announce Failure
         id: slack
-        uses: slackapi/slack-github-action@v1.24.0
+        uses: slackapi/slack-github-action@v1.26.0
         env:
           # for non-CLI-team-owned plugins, you can send this anywhere you like
           SLACK_WEBHOOK_URL: ${{ secrets.CLI_ALERTS_SLACK_WEBHOOK }}