sentry-sdk 1.21.1

on Python PyPI

Various fixes & improvements

• Do not send monitor_config when unset (#2058) by @evanpurkhiser
• Add db.system span data (#2040, #2042) by @antonpirker
• Fix memory leak in profiling (#2049) by @Zylphrex
• Fix crash loop when returning none in before_send (#2045) by @sentrivana