[version] Update to the latest test package

[jonahwilliams]

Description

Might help with web flakes

[christopherfujino]

RSLGTM

[christopherfujino]

Hmm, failure on tool_tests-integration-macos:

01:05 +2 -1: test/integration.shard/downgrade_upgrade_integration_test.dart: Can upgrade and downgrade a Flutter checkout [E]                                                                          
  Expected: contains 'v1.9.1+hotfix.6'
    Actual: ''
  package:test_api                                                                          expect
  org-dartlang-app:///test/integration.shard/downgrade_upgrade_integration_test.dart 120:5  main.<fn>

[jonahwilliams]

Looks like its the usual:

error: RPC failed; curl 56 LibreSSL SSL_read: SSL_ERROR_SYSCALL, errno 60
fatal: the remote end hung up unexpectedly
fatal: early EOF
fatal: index-pack failed
fatal: not a git repository (or any of the parent directories): .git
fatal: not a git repository (or any of the parent directories): .git