dartdoc.dart generate pubspec.yaml doesn't use Dart language versioning #70239
Description
Split off from #70084, reported by @mit-mit
The logic in dev/tool/dartdoc.dart calculates package versions by writing a temporary pubspec.yaml file. This file doesn't have an SDK constraint, so it's language version is undefined.
// Create the pubspec.yaml file.
final StringBuffer buf = StringBuffer();
buf.writeln('name: $kDummyPackageName');
buf.writeln('homepage: https://flutter.dev');
// TODO(dnfield): Re-factor for proper versioning, https://github.com/flutter/flutter/issues/55409
buf.writeln('version: 0.0.0');https://github.com/flutter/flutter/blob/master/dev/tools/dartdoc.dart#L53
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Issues that are less important to the Flutter projectA detailed proposal for a change to FlutterOwned by Flutter Tool teamAffects the "flutter" command-line tool. See also t: labels.Issues that have been deemed still valid as part of the Flutter Tools issue cleanup initiative.Triaged by Flutter Tool team