[gardening] Fix dart2 errors in socket_upgrade_to_secure_test. This is follow-up to d528e1651f9fce394762961a0f9fc25dd6d406a8 (https://dart-review.googlesource.com/c/sdk/+/30389/) Should help with https://github.com/dart-lang/sdk/issues/35104 Change-Id: I13070961e95ee53339d41e369863cd91aeb21e30 Reviewed-on: https://dart-review.googlesource.com/c/83780 Reviewed-by: Ryan Macnak <rmacnak@google.com> Commit-Queue: Alexander Aprelev <aam@google.com>
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