Update to latest package:http_multi_server
Update to latest package:http_multi_server

Fixes a test for compatibility with google3.

Change-Id: Id85c531b6768b6a59f2f63e991de96dd92ab3232
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/175446
Auto-Submit: Nate Bosch <dc212c74d8afde9c690fdd09e74d3e5c5d5a3de0@google.com>
Commit-Queue: David Morgan <c99f6ead588e81ca6564615e2a62f86df17041f2@google.com>
Reviewed-by: David Morgan <c99f6ead588e81ca6564615e2a62f86df17041f2@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