Add master channel to performance issue template (#32345)

I helped the daily mail debug a performance issue on I/O yesterday. Not
using the master branch could be wasting a lot of time due to old bugs.
1 file changed
tree: a4e76a40c7ac549e00f55a85f24d2eb4992acf7a
  1. .github/
  2. bin/
  3. dev/
  4. examples/
  5. packages/
  6. .cirrus.yml
  7. .gitattributes
  8. .gitignore
  9. analysis_options.yaml
  10. AUTHORS
  11. CODE_OF_CONDUCT.md
  12. CONTRIBUTING.md
  13. dartdoc_options.yaml
  14. flutter_console.bat
  15. LICENSE
  16. PATENTS
  17. README.md
README.md

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