Firebase Admin Python SDK v6.7.0

New Features

• feat(rc): Sever Side Remote Config Integration (#863)

Miscellaneous

• [chore] Release 6.7.0 (#867)
• chore: Add tests for Reference.listen() (#851)
• pass clinet"s params to SSEClient (#845)
• Revert "chore: Adding delayed response message for holidays (#842)" (#848)
• chore: Adding delayed response message for holidays (#842)
• chore: Skip integration test for deprecated FCM API and bump pypy CI to 3.9 (#840)