[analyzer] Potential bug in `use_build_context_synchronously`

[incendial]

Hi!

Given the comment, it looks like this https://github.com/dart-lang/sdk/blob/main/pkg/linter/lib/src/rules/use_build_context_synchronously.dart#L1064 should be a 'StreamSubscription', not 'Stream'.

Same for other entries below.

[srawlins]

Great catch!

[srawlins]

Fixed with 51f8b43

[dart-github-bot]

Summary: The use_build_context_synchronously analyzer rule incorrectly uses Stream instead of StreamSubscription in several places, leading to potential errors. A fix is needed.