Update textmate grammar to latest version (#9920)

* Update textmate grammar to latest version

This updates the grammar to the latest version from https://github.com/dart-lang/dart-syntax-highlight and regenerates the goldens.

(I have another upcoming change, but to simplify reviewing, I didn't want to mix it in with previous updates here)

* Remove old reference to new keyword. We don't treat it as a control keyword anymore.

* Update NEXT_RELEASE_NOTES.md
4 files changed
tree: 610f804ab0624c5fedd9426e3439562d198c76c6
  1. .agents/
  2. .gemini/
  3. .github/
  4. .vscode/
  5. _markdown_images/
  6. docs/
  7. packages/
  8. third_party/
  9. tool/
  10. .gitattributes
  11. .gitignore
  12. AGENTS.md
  13. analysis_options.yaml
  14. AUTHORS
  15. BETA_TESTING.md
  16. CLAUDE.md
  17. CODE_OF_CONDUCT.md
  18. CODEOWNERS
  19. CONTRIBUTING.md
  20. DEBUGGING.md
  21. devtools_options.yaml
  22. DOCUMENTATION.md
  23. flutter-candidate.txt
  24. LICENSE
  25. pubspec.lock
  26. pubspec.yaml
  27. README.md
  28. STYLE.md
  29. TESTING.md
  30. TRIAGE.md
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