Switch analysis_server/ to 2.17
Switch analysis_server/ to 2.17

We don't publish it, so we can use the latest language version, as
long as it works with the SDK and inside google3.

Change-Id: I60f7fb4dcedc4205ed95f8c19d5d335449f3cbe0
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/240800
Reviewed-by: Brian Wilkerson <1f7641b6b14c52b9163524ab8d9aabff80176f21@google.com>
Commit-Queue: Konstantin Shcheglov <09e4d7516628963212bf4aace2f97603d2b706e4@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