…lutter#188357)

This bumps Dart across the repo to 3.11, with a few exceptions. I am
authoring a skill (tbd) and script
(flutter#187800) to do this in the
future.

After this, I will be moving us to 3.12 to continue to iterate on the
skill and script before proposing to check them in.

There are some places where the Dart version has deviated from the
consistent standard across the repo. I have considered changing these as
out of scope for this PR since they are broken when changed. We should
consider updating them to reflect a uniform version for the repo. They
made for interesting edge cases in the script and skill development. 🙂

- flutter/dev/integration_tests/widget_preview_scaffold/pubspec.
  yaml
- This is on Dart 3.12. It cannot be changed since the source code has
already adopted 3.12 language features
- All of these integration tests have a range set (>=3.5.0-0 <4.0.0),
and resolve to 3.13 in CI:
  - flutter/dev/integration_tests/data_asset_app/pubspec.yaml
  - flutter/dev/integration_tests/data_asset_package/pubspec.yaml
  - flutter/dev/integration_tests/record_use_test_app/pubspec.yaml
  - flutter/dev/integration_tests/record_use_test_package/pubspec.
  yaml
  - flutter/dev/integration_tests/hybrid_android_views/pubspec.
  yaml

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