dart-lang Update Packages
[!IMPORTANT] Sequential Execution Required: All steps must be executed strictly one after another in sequence in a single execution context. Do NOT use parallel subagents or run commands concurrently across channels, as switching Flutter SDK channels modifies shared local SDK state.
Step 1: Update allowlist (if needed)
If adding or removing packages, edit lib/src/project_templates.dart first.
This file contains the allowlist of supported packages. Skip this step if only
updating versions.
Step 2: Update dependencies for each channel
Run the following sequentially for each channel (stable, beta, main):
flutter channel <CHANNEL>
flutter upgrade
dart tool/grind.dart update-pub-dependencies
Step 3: Switch back to stable
flutter channel stable
Step 4: Verify changes
Check git status and git diff to confirm the expected changes to
tool/dependencies/pub_dependencies_stable.json, pub_dependencies_beta.json,
and pub_dependencies_main.json.