Announce pull requests

Workflow runs for Announce pull requests

• Rename the pin check to "Action pin check"

  completed successfully:
  Announce pull requests#2:Pull request#17openedbyclaudeleet
  rename-action-pin-check

  Oct 15, 20267s
  More actions for workflow run 2

• Announce pull requests to Slack, post through a bot token, and call at version tags

  completed successfully:
  Announce pull requests#1:Pull request#16openedbyclaudeleet
  notify-new-pull-requests

  Oct 15, 202610s
  More actions for workflow run 1