[hhh] Update cached flutter_web_sdk with freshly built one

Change-Id: Id692c8d274ae0489bed7a705d38ab390d4141c3e
Reviewed-on: https://dart-review.googlesource.com/c/recipes/+/196700
Reviewed-by: Alexander Thomas <athom@google.com>
Commit-Queue: Alexander Aprelev <aam@google.com>
6 files changed