1.28.1

Various fixes & improvements

• Redis: Add support for redis.asyncio (#1933) by @Zhenay
• Make sure each task that is started by Celery Beat has its own trace. (#2249) by @antonpirker
• Add Sampling Decision to Trace Envelope Header (#2239) by @antonpirker
• Do not add trace headers (sentry-trace and baggage) to HTTP requests to Sentry (#2240) by @antonpirker
• Prevent adding sentry-trace header multiple times (#2235) by @antonpirker
• Skip distributions with incomplete metadata (#2231) by @rominf
• Remove stale.yml (#2245) by @hubertdeng123
• Django: Fix 404 Handler handler being labeled as "generic ASGI request" (#1277) by @BeryJu