Release v12.1.0

2024/11/16 Version 12.1.0

• New features in pyee.asyncio.AsyncIOEventEmitter:
  • wait_for_complete method to wait for all running handlers to complete
    execution
  • cancel method to cancel execution of all running handlers
  • complete property that's True when no handlers are currently running
• Updated changelog for v12 release to describe where to find alternatives
  to deprecated and removed imports
• Add support for Python 3.13
• Upgrade GitHub Actions
• Upgrade actions/setup-python to v5
• Upgrade actions/setup-node to v4
• Upgrade actions/upload-artifact to v4
• Updated CONTRIBUTORS.md to include missing contributors