16553 Roll src/third_party/dart e4c39721c473..0299903f3e78 (31 commits) (cla: yes, waiting for tree to go green)

16555 Roll fuchsia/sdk/core/mac-amd64 from 7JkB7… to t4kck… (cla: yes, waiting for tree to go green)

16556 Enable lazy-async-stacks by-default in all modes (cla: yes)

16557 [web] Fix edge cases in Paragraph.getPositionForOffset to match Flutter (affects: text input, cla: yes, platform-web)

16558 Revert “Re-land: Use os_log instead of syslog on Apple platforms (#16… (cla: yes)

16559 Update felt documentation (cla: yes, platform-web)