1.39.0

Various fixes & improvements

• Add support for cluster clients from Redis SDK (#2394) by @md384
• Improve location reporting for timer metrics (#2552) by @mitsuhiko
• Fix Celery TypeError with no-argument apply_async (#2575) by @szokeasaurusrex
• Fix Lambda integration with EventBridge source (#2546) by @davidcroda
• Add max tries to Spotlight (#2571) by @HazAT
• Handle os.path.devnull access issues (#2579) by @sentrivana
• Change code.filepath frame picking logic (#2568) by @sentrivana
• Trigger AWS Lambda tests on label (#2538) by @sentrivana
• Run permissions step on pull_request_target but not push (#2548) by @sentrivana
• Hash AWS Lambda test functions based on current revision (#2557) by @sentrivana
• Update Django version in tests (#2562) by @sentrivana
• Make metrics tests non-flaky (#2572) by @antonpirker