[dart_internal] Bump SDK constraint upper-bound to <2.5.0

Issue: #37324
Change-Id: Ibea63bb775c83484523fb8d6caeda918df25e849
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/106949
Reviewed-by: Bob Nystrom <rnystrom@google.com>
Commit-Queue: Nicholas Shahan <nshahan@google.com>

pkg/dart_internal/pubspec.yaml

@@ -1,5 +1,5 @@
 name: dart_internal
-version: 0.1.4
+version: 0.1.5
 author: "Dart Team <misc@dartlang.org>"
 homepage: http://www.dartlang.org
 description: >
@@ -16,4 +16,4 @@ description: >
 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: ">=2.0.0-dev.12.0 <2.4.0"
+  sdk: ">=2.0.0-dev.12.0 <2.5.0"