* Add 'v' hotkey to open DevTools in the browser

This reverts commit 28db5a0f.

This reverts commit 8e73bab9.

This reverts ae0a9cb5 and therefore relands #69629.

Additionally, `flutter update-packages --force-upgrade` has been run to update `pubspec.yaml` to resolve the analyze test failures.

* update pinned null safety deps

* run update-packages

* add http dep to devicelab package

* rerun update-packages

This reverts commit dd9323bd.

Based on feedback from various desktop developers, and to be consistent between the defaults and the sample code, this PR switches the default for visual density in desktop themes to be compact instead of standard.

It also removes the same setting from the sample code generated by "flutter create" because it is no longer needed now that it is the default.

Updates all null safe dependencies to versions that allow 2.10 stable and 2.11 dev releases.

Also updates flutter_goldens and flutter_goldens_client to allow 2.11 dev.