1.9.9

Django update (ongoing)

• Instrument Django Signals so they show up in "Performance" view (#1526) by @BeryJu
• include other Django enhancements brought up by the community

Various fixes & improvements

• fix(profiling): Profiler mode type hints (#1633) by @Zylphrex
• New ASGIMiddleware tests (#1600) by @antonpirker
• build(deps): bump mypy from 0.961 to 0.971 (#1517) by @dependabot
• build(deps): bump black from 22.3.0 to 22.8.0 (#1596) by @dependabot
• build(deps): bump sphinx from 5.0.2 to 5.1.1 (#1524) by @dependabot
• ref: upgrade linters to flake8 5.x (#1610) by @asottile-sentry
• feat(profiling): Introduce different profiler schedulers (#1616) by @Zylphrex
• fix(profiling): Check transaction sampled status before profiling (#1624) by @Zylphrex
• Wrap Baggage ser/deser in capture_internal_exceptions (#1630) by @sl0thentr0py
• Faster Tests (DjangoCon) (#1602) by @antonpirker
• feat(profiling): Add support for profiles_sample_rate (#1613) by @Zylphrex
• feat(profiling): Support for multithreaded profiles (#1570) by @Zylphrex