Fixes

• 🐛 Fix handling sequences with nested Annotated types. PR #14874 by @YuriiMotov.

Internal

• 🐛 Accept any base test failure as regression. PR #16092 by @tiangolo.
• 🐛 Preserve pytest exit code in regression check. PR #16091 by @tiangolo.
• ✅ Test PR regressions against base code. PR #16090 by @tiangolo.