Add Dart 2.11 to dart_internal SDK constraint.

Change-Id: I5d6f6dd89f99b7b6b88f7683c90f49311823c82e
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/164252
Auto-Submit: Bob Nystrom <rnystrom@google.com>
Commit-Queue: Jake Macdonald <jakemac@google.com>
Reviewed-by: Jake Macdonald <jakemac@google.com>
diff --git a/pkg/dart_internal/pubspec.yaml b/pkg/dart_internal/pubspec.yaml
index 757bdf3..191de63 100644
--- a/pkg/dart_internal/pubspec.yaml
+++ b/pkg/dart_internal/pubspec.yaml
@@ -1,5 +1,5 @@
 name: dart_internal
-version: 0.1.11-nullsafety
+version: 0.1.12-nullsafety
 author: "Dart Team <misc@dartlang.org>"
 homepage: http://www.dartlang.org
 repository: https://github.com/dart-lang/sdk/tree/master/pkg/dart_internal
@@ -18,4 +18,4 @@
 environment:
   # Restrict the upper bound so that we can remove support for this in a later
   # version of the SDK without it being a breaking change.
-  sdk: ">=2.10.0-0.0 <2.10.0"
+  sdk: ">=2.10.0-0 <2.11.0"