Update package:sse dep
Update package:sse dep

Change-Id: I1768c275b652ce7c86e001221c8fc849087dd034
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/183701
Reviewed-by: Nate Bosch <dc212c74d8afde9c690fdd09e74d3e5c5d5a3de0@google.com>
Auto-Submit: Gary Roumanis <d5b6b5e05b98e5bbacdd1eed49204da9b1e1f2d1@google.com>
Commit-Queue: Gary Roumanis <d5b6b5e05b98e5bbacdd1eed49204da9b1e1f2d1@google.com>

dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk