Update dart/language_model rev to EFtZ0Z5T822s4EUOOaWeiXUppRGKp5d9Z6jomJIeQYcC
Update dart/language_model rev to EFtZ0Z5T822s4EUOOaWeiXUppRGKp5d9Z6jomJIeQYcC

This version of the dart/language_model CIPD package sets the package attribute
preserve_writable: true and removes the read-only CIPD version file.

Bug: https://github.com/dart-lang/sdk/issues/37698
Change-Id: I3823decf92518dd4e4eb39e8862eb98550fcf2af
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/111983
Commit-Queue: Ari Aye <887318a43abb1f76a1ef6447b9569f03dbad95a8@google.com>
Reviewed-by: Alexander Thomas <29642742b6693024c89de8232f2e2542cf7eedf7@google.com>

dartino/dart-sdk,dart-archive/dart-sdk,dartino/dart-sdk,dart-archive/dart-sdk,dart-archive/dart-sdk,dart-archive/dart-sdk,dartino/dart-sdk,dart-archive/dart-sdk,dartino/dart-sdk,dart-archive/dart-sdk,dart-archive/dart-sdk,dart-lang/sdk,dartino/dart-sdk,dartino/dart-sdk,dart-archive/dart-sdk,dartino/dart-sdk,dart-lang/sdk,dart-lang/sdk,dartino/dart-sdk,dartino/dart-sdk,dart-lang/sdk,dart-lang/sdk,dart-archive/dart-sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk