Bump dart_internal to allow 2.12.0.

Change-Id: I05cc978b2b4b7dbd1bf1e1f4d45375646ea90bff
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/186400
Reviewed-by: Nicholas Shahan <nshahan@google.com>
Commit-Queue: Nicholas Shahan <nshahan@google.com>
Auto-Submit: Bob Nystrom <rnystrom@google.com>
diff --git a/.dart_tool/package_config.json b/.dart_tool/package_config.json
index f687245..6e9dc2f 100644
--- a/.dart_tool/package_config.json
+++ b/.dart_tool/package_config.json
@@ -11,7 +11,7 @@
     "constraint, update this by running tools/generate_package_config.dart."
   ],
   "configVersion": 2,
-  "generated": "2021-02-19T10:27:13.251974",
+  "generated": "2021-02-22T14:34:08.519603",
   "generator": "tools/generate_package_config.dart",
   "packages": [
     {
@@ -214,7 +214,7 @@
       "name": "dart_internal",
       "rootUri": "../pkg/dart_internal",
       "packageUri": "lib/",
-      "languageVersion": "2.10"
+      "languageVersion": "2.12"
     },
     {
       "name": "dart_style",
diff --git a/pkg/dart_internal/pubspec.yaml b/pkg/dart_internal/pubspec.yaml
index 64adb7f..3be9909 100644
--- a/pkg/dart_internal/pubspec.yaml
+++ b/pkg/dart_internal/pubspec.yaml
@@ -1,5 +1,5 @@
 name: dart_internal
-version: 0.1.12-nullsafety.1
+version: 0.2.0
 repository: https://github.com/dart-lang/sdk/tree/master/pkg/dart_internal
 description: >
   This package is not intended for wide use. It provides a temporary API to
@@ -16,4 +16,4 @@
 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 <2.12.0"
+  sdk: ">=2.12.0-0 <2.13.0"